I'm a Plant Manager looking to implement lean manufacturing. How do I find a good lean manufacturing consultant?

A good lean consultant should develop your plant’s problem-solving capability, not simply install a toolkit or hand you a PowerPoint report. Lean Enterprise Institute makes a similar distinction: effective coaching happens around real work and helps the client develop the capability to sustain improvement after the consultant leaves.

1. Define what you actually need first

“Implement lean” is too broad for a consultant-selection process. As Plant Manager, I'd define the first 12–18 months around a handful of measurable business problems, such as:

• Improve OEE or throughput
• Reduce WIP and lead time
• Improve schedule adherence
• Reduce scrap/rework
• Establish standard work
• Develop frontline problem-solving
• Create daily management/visual management
• Improve material flow and line balance
• Build a sustainable kaizen system

There's an important distinction between a consultant who specializes in individual process kaizen and one who can coach a broader value-stream or management-system transformation. LEI specifically recommends determining which type you need before hiring.

2. Look for these qualifications

I'd put the following near the top of your selection criteria:

Hands-on plant experience

Ask:

“Show me three manufacturing plants where you personally helped create measurable improvement. What was the starting condition, what did you change, and what happened 12 and 24 months later?” Look for people who have actually run or transformed operations, rather than people whose experience consists primarily of training or auditing.

Experience with the Toyota Production System is particularly relevant if that's the lean philosophy you're pursuing. LEI recommends looking for consultants with direct TPS experience or training under experienced Toyota practitioners.

Ability to coach your managers

This is crucial.

A consultant who personally fixes every problem can make the plant look better temporarily while leaving you dependent on them. A stronger consultant gets your supervisors, engineers and managers to learn how to identify problems, run PDCA/A3 cycles and sustain improvements.

LEI describes this explicitly as developing the organization's problem-solving capability rather than simply telling people what to do.

Evidence of sustained results

Don't be satisfied with:

“We reduced changeover time by 40% during the kaizen event.” Ask:

“What was the result six months later?” And:

“Can I speak privately with the Plant Manager who hired you?” Even better, visit one of their former client plants. LEI's guidance specifically recommends checking candidates' previous work by visiting companies where they were involved for a substantial period.

Understanding of leadership and culture

Be cautious about consultants whose entire approach is:

5S → Kanban → VSM → Kaizen events → Lean certification

Those tools can be useful, but sustainable lean transformation also involves management behavior, problem-solving, standard work, accountability and developing people.

The Shingo Institute, for example, evaluates whether organizational systems are producing behaviors that support sustainable results rather than merely short-term gains.

3. Interview consultants with a practical exercise

I'd give each finalist the same scenario.

For example:

“Our plant has 30% excess WIP, 82% schedule adherence, frequent expedited orders and a bottleneck on Assembly Line 3. What would you do during your first 30 days?” Then listen carefully.

A strong candidate will probably want to go see the process before prescribing solutions. They should ask about customer demand, takt, product mix, downtime, staffing, quality, material flow, standard work, constraints and existing management routines.

Be wary if the response immediately becomes:

“We'll conduct a 5S event, create a value-stream map and implement Kanban.” That's prescribing tools before understanding the problem.

4. Ask these 10 questions

I'd use these almost verbatim:

1. What manufacturing environments have you personally transformed?
2. What was your role—you led the transformation, coached it, or trained people?
3. Can I speak with three former clients, including one Plant Manager?
4. Can I visit one of your previous implementations?
5. What would you do during our first 30 days?
6. How much time will you actually spend on our shop floor?
7. How will you develop our supervisors and managers rather than doing the work for them?
8. How will we measure whether the transformation is working?
9. What happens after your initial engagement ends?
10. What would cause you to tell us not to implement a particular lean tool?

That last question is surprisingly revealing.

5. Structure the engagement differently from a typical consulting project

I'd avoid:

“Come in for 90 days and make us lean.” Instead, consider something like:

Phase 1 — Diagnose and align

• Gemba observation
• Current-state performance
• Value-stream analysis
• Leadership assessment
• Identify 1–3 critical business problems
• Define measurable targets

Phase 2 — Pilot

Pick one value stream or production area and work alongside your managers.

For example:

Supplier → Receiving → Machining → Assembly → Shipping

The consultant coaches while your people actually run the improvement.

Phase 3 — Management system

Build routines around:

• Daily accountability
• Visual management
• Standard work
• A3/PDCA
• Leader standard work
• Escalation
• Problem-solving

Phase 4 — Internal capability

Gradually reduce consultant involvement while your own leaders take over.

That's consistent with LEI's current emphasis on working alongside teams on real business problems and building capability that remains after the engagement ends.

6. Where I'd look

Two useful starting points are:

• lean.org — particularly useful if you want coaching grounded in the Toyota Production System. LEI currently describes its approach as hands-on coaching around real business challenges rather than simply delivering recommendations.
• shingo.org — useful for understanding organizational excellence and for finding people connected with the Shingo Model. The Institute maintains a network of Faculty Fellows and licensed affiliates.

Certifications can be useful evidence of knowledge, but I wouldn't make certification the deciding factor. Actual transformation experience, references and demonstrated coaching ability matter much more for a Plant Manager selecting someone to work inside the operation.

My suggested selection scorecard

Rather than asking “Who has the best credentials?”, I'd evaluate finalists on:

The key is that this is a selection framework, not a substitute for checking references.

If you tell me your industry, approximate plant size, number of production employees, biggest 2–3 operational problems, and where the plant is located, I can help you build a consultant RFP/interview scorecard and identify the types of firms or individual consultants you should approach.

Ask:

“What was the result six months later?” And:

“Can I speak privately with the Plant Manager who hired you?” Even better, visit one of their former client plants. LEI's guidance specifically recommends checking candidates' previous work by visiting companies where they were involved for a substantial period.

Understanding of leadership and culture

Be cautious about consultants whose entire approach is:

5S → Kanban → VSM → Kaizen events → Lean certification

Those tools can be useful, but sustainable lean transformation also involves management behavior, problem-solving, standard work, accountability and developing people.

The Shingo Institute, for example, evaluates whether organizational systems are producing behaviors that support sustainable results rather than merely short-term gains.

3. Interview consultants with a practical exercise

I'd give each finalist the same scenario.

For example:

“Our plant has 30% excess WIP, 82% schedule adherence, frequent expedited orders and a bottleneck on Assembly Line 3. What would you do during your first 30 days?” Then listen carefully.

A strong candidate will probably want to go see the process before prescribing solutions. They should ask about customer demand, takt, product mix, downtime, staffing, quality, material flow, standard work, constraints and existing management routines.

Be wary if the response immediately becomes:

“We'll conduct a 5S event, create a value-stream map and implement Kanban.” That's prescribing tools before understanding the problem.

4. Ask these 10 questions

I'd use these almost verbatim:

Finding the right lean manufacturing consultant is less about buying a standard toolkit and more about finding a partner who can coach your team to build a sustainable culture of continuous improvement . As a Plant Manager, your goal is to drive operational change that sticks on the shop floor while keeping executive leadership aligned.

Here is a step-by-step roadmap to finding, vetting, and selecting the right lean consultant for your plant:

1. Where to Search for Candidates

• Industry Associations & Non-Profits: Check out regional networks like the Association for Manufacturing Excellence (AME) or your local MEP (Manufacturing Extension Partnership) center. MEPs are government-backed, highly trusted, and specifically designed to help small-to-midsize manufacturers implement lean at an affordable rate.
• Peer Referrals: Reach out to Plant Managers in non-competing plants within your local area or industry sector. Ask who they used and, crucially, what went wrong or what they wish they had known beforehand.
• Professional Networks: Use platforms like LinkedIn or curated marketplaces such as Upwork Lean Consultants to find specialized independent contractors or boutique firms with verified manufacturing backgrounds.
• Specialized Boutique Firms: Look for established operational excellence groups (like GBMP or Campbell Corporation ) that specialize explicitly in manufacturing floor layouts, value stream mapping, and cultural transformations.

2. Key Criteria to Evaluate Candidates

1. Gemba & Floor-Level Experience: Avoid career consultants who only speak in theoretical boardroom jargon. Ensure they have spent years on real manufacturing shop floors and know the practical realities of dealing with operators, union dynamics, and machine downtime.
2. Focus on Capability, Not Dependency: A great consultant works with your people, not for them. They should coach your internal team to run their own Value Stream Maps (VSMs) and Kaizen events rather than leaving behind a binder of statistics.
3. A Bias Toward Action: Beware of firms that spend months analyzing and generating massive PowerPoint decks without executing rapid improvements. Look for a proven process that targets quick wins while building long-term capability.
4. Cultural & Communication Fit: They must be able to command respect and talk shop with a CNC machinist or assembly operator, while cleanly translating the financial ROI up to your VP or corporate stakeholders.

3. Red Flags to Watch Out For

• The "Instant Transformation" Pitch: Be deeply cautious of anyone promising overnight fixes or guaranteed massive percentage jumps in OEE within weeks. Lean is a disciplined marathon, not a sprint.
• One-Size-Fits-All Approach: If they try to push a rigid, off-the-shelf program without first conducting an in-depth operational assessment of your specific plant bottlenecks, run away.
• The Bargain Trap: The cheapest consultant is rarely the best. Ineffective implementation can stall your plant culture and waste months of momentum, costing far more than a seasoned expert.

To help narrow down the search, tell me:

• What is your plant's primary bottleneck or pain point (e.g., long changeover times, high scrap rates, poor on-time delivery)?
• What is the size of your facility/headcount , and are you looking for an individual contractor or a larger firm?

I can provide a more tailored profile of the exact type of expertise you should target.

As a Plant Manager, the best lean manufacturing consultant is usually not the one with the most impressive slide deck or the most certifications — it is the one who can walk your floor, understand your constraints, coach your supervisors, and leave your team able to sustain improvements.

A practical approach:

1. Define what you need the consultant to accomplish

Before contacting anyone, write down your current problems and desired outcomes. Examples:

• Reduce changeover time
• Improve OEE
• Reduce scrap/rework
• Improve on-time delivery
• Create standard work
• Implement daily management systems
• Train supervisors in problem solving
• Develop an internal continuous improvement team

A consultant who specializes in plant turnarounds may not be the right fit if your main need is building a long-term lean culture.

2. Look for manufacturing experience, not just lean vocabulary

Ask candidates:

• “What factories have you personally improved?”
• “What was the starting condition?”
• “What measurable results did you achieve?”
• “What role did you personally play?”
• “Can I speak with two or three former clients?”

Strong answers include metrics such as:

• 40% reduction in setup time
• 20% improvement in throughput
• reduced WIP by a specific amount
• improved first-pass yield
• shortened lead time

Be cautious with consultants who mainly talk about tools (5S, Kaizen, VSM, Six Sigma) without explaining business results.

3. Evaluate their approach to implementation

A good consultant should typically:

1. Observe your operation (a real gemba walk)
2. Assess your current state
3. Identify priority opportunities
4. Run improvement events with your employees
5. Train your leaders
6. Create management routines to sustain gains

Avoid anyone who arrives with a generic “12-month lean transformation” presentation before understanding your plant.

4. Check credentials — but don’t rely on them alone

Useful indicators include:

• Lean practitioner experience
• Lean Six Sigma credentials
• Participation in recognized certification programs
• Membership or involvement with lean organizations

For example, the Opex Academy | SHINGO INSTITUTE AFFILIATE offers a certification framework focused on demonstrated lean knowledge and application, not just classroom attendance.

However, a person with years of successful plant implementation experience may be more valuable than someone with many certificates but little operating experience.

5. Interview them like you would hire a plant leader

Good interview questions:

• “Tell me about the toughest workforce resistance you encountered. How did you handle it?”
• “How do you involve operators?”
• “What will my supervisors be doing differently after six months?”
• “What happens after your contract ends?”
• “What percentage of your time will be on the shop floor?”
• “Who exactly will be assigned to my plant?”

You want someone who develops your people, not someone your plant becomes dependent on.

6. Start with a focused pilot

Instead of hiring someone for an entire plant transformation immediately:

• Pick one value stream or production area
• Define baseline metrics
• Run a 60–90 day improvement effort
• Measure results
• Decide whether to expand

A successful pilot often reveals whether the consultant fits your culture.

7. Where to find candidates

Good sources include:

• Industry associations
• Lean practitioner networks
• Referrals from other Plant Managers
• Manufacturing extension organizations
• Former operations leaders who became consultants

Organizations such as the Association for Manufacturing Excellence and the Lean Enterprise Institute are useful places to connect with experienced practitioners.

Red flags

Be careful if a consultant:

• Promises a specific dollar savings before seeing your plant
• Focuses heavily on terminology and acronyms
• Has no recent factory experience
• Wants to train everyone but not work on actual processes
• Does not ask about your customers, products, constraints, or culture
• Cannot provide references

If you tell me your industry (automotive, food, medical devices, metal fabrication, etc.), plant size, location, and biggest pain points, I can suggest a more targeted way to screen consultants and what type of lean expert you should look for.

You can find a qualified lean manufacturing consultant by leveraging industry networks, local manufacturing extension partnerships, and professional certification directories to vet candidates who focus on hands-on cultural transformation rather than just theoretical classroom training.

Steps to Find and Vet a Lean Consultant

1. Leverage Local Resources and Non-Profits : Start with your state's Manufacturing Extension Partnership (MEP) center, affiliated with the National Institute of Standards and Technology (NIST) . MEPs offer heavily subsidized, highly vetted operational experts who understand regional industrial landscapes.
2. Consult Professional Associations : Look through directories for organizations like Association for Manufacturing Excellence (AME) or Shingo Institute , which vet practitioners based on proven operational excellence principles.
3. Evaluate Hands-On Teaching Style : Avoid consultants who rely purely on slide decks. Choose providers who offer learn-by-doing facilitation, actively involving shop floor employees at multiple levels to map processes and test improvements.
4. Request Case Studies and References : Ask for concrete before-and-after metrics from plants similar in size and sector to yours. Speak directly with previous plant managers they have worked with.
5. Run a Pilot Project : Start with a small, focused engagement—such as a single value stream mapping exercise or a targeted 5S/Kaizen event—before committing to a long-term plant-wide transformation contract.

If you'd like, let me know:

• Your specific industry sector (e.g., automotive, food processing, electronics)
• The size of your facility (headcount and square footage)
• Your primary pain point (e.g., high scrap rates, long changeover times, bottlenecks)

I can give you more tailored advice on what specific frameworks or credentials to look for in a partner.

If you’re a Plant Manager, I’d look for a lean coach who can build capability inside your plant, not a consultant who leaves you with a PowerPoint deck and a list of projects.

A good selection process looks like this:

1. Define what you actually need

Before contacting consultants, write down the business problems you want Lean to solve. For example:

• OEE is 55% and needs to reach 70%.
• Lead time is 12 days and needs to get below 5.
• Excess WIP is tying up $2M in inventory.
• Scrap/rework is 6%.
• On-time delivery is 82%.
• Supervisors spend their days firefighting.
• Problem-solving is inconsistent.
• You want a sustainable daily-management/continuous-improvement system.

This matters because Lean consultants can have very different strengths. The Lean Enterprise Institute distinguishes between consultants focused on process kaizen, flow/value-stream improvement, and broader transformational change.

2. Look for these characteristics

I'd put these near the top of your evaluation criteria:

Shop-floor experience. They should be comfortable spending most of the day at the gemba—not sitting in a conference room.

Manufacturing experience similar to yours. Ideally they've worked with your type of production: discrete, process, high-mix/low-volume, automotive, aerospace, food, medical devices, etc.

Measurable results. Ask for specific before/after results, such as:

"Tell me about a plant where you personally helped reduce lead time. What was it before, what was it afterward, how long did it take, and what did you personally do?" Be suspicious of answers consisting mainly of percentages without context.

Leadership development. A strong consultant should teach your supervisors, engineers, operators and managers how to solve problems rather than becoming the person everyone calls to fix problems.

Long-term thinking. LEI specifically recommends checking whether a consultant created sustainable results and whether knowledge was transferred to the client rather than creating "consultant dependency."

Ability to work with operators. This is underrated. You want somebody who can walk onto a production line, gain the trust of operators, understand the actual work and engage them in improvement.

3. Don't overvalue certifications

Certifications can be useful evidence of knowledge, but I wouldn't hire someone because they have a Lean Six Sigma Black Belt.

Ask:

"What have you actually changed in manufacturing environments?" Organizations such as ASQ offer Lean credentials covering value-stream mapping, waste elimination, kaizen, A3, gemba, flow and related practices. That's useful background, but practical transformation experience is what I'd weight most heavily.

You can also use asq.org as one source of candidates.

4. Ask for references—and actually visit one

This may be the single most valuable step.

Ask each finalist for 2–3 manufacturing references where they personally did substantial work.

Then ask the reference:

• What was the plant's situation before they arrived?
• What did they actually accomplish?
• What metrics improved?
• How long did the improvements last?
• What happened after the consultant left?
• Did they develop your internal people?
• What would you do differently?
• Would you hire them again?

Even better: visit one of their former client plants.

LEI makes essentially this recommendation: don't just accept testimonials; examine the consultant's previous work and whether the results were sustainable.

5. Interview them on the plant floor

I would make this part of the selection process.

Give each finalist a 60–90 minute tour of your plant.

Don't explain everything beforehand.

Take them to:

• your worst-performing line
• an area with excessive WIP
• a bottleneck
• an area with quality problems
• your scheduling/production-control process

Then ask:

"What do you see?" A good Lean practitioner will start asking questions about flow, standard work, takt, cycle time, constraints, inventory, defects, downtime, changeovers, abnormal conditions and management systems.

A mediocre consultant will start giving you a presentation.

That's a very useful distinction.

6. Make them propose a pilot—not a giant transformation

I would strongly resist signing a large 12–24 month Lean transformation contract initially.

Instead, consider something like:

90-day pilot

1. Select one value stream.
2. Establish baseline metrics.
3. Map the current state.
4. Identify the primary constraint/waste.
5. Implement improvements.
6. Establish daily management.
7. Train your internal leaders.
8. Measure results.
9. Document the management system.
10. Decide whether to expand.

This lets you evaluate the consultant while simultaneously getting business results.

The best consultants should be comfortable working on a real business problem while teaching your team the methods. That's also the approach emphasized by LEI in its current organizational consulting model.

7. Be very clear about the commercial model

I'd ask every consultant:

• What exactly are we buying?
• How many days per month will you physically be in the plant?
• Who will actually do the work?
• How much time will be spent training our people?
• What deliverables do we receive?
• What KPIs will we establish?
• How will you measure financial impact?
• How do you transfer knowledge?
• What happens when your engagement ends?
• What expenses are additional?
• Can we terminate after the pilot?

I'd favor a smaller experienced practitioner who is personally on-site over a large consulting firm where the senior person sells the engagement and junior consultants execute it.

8. Watch for these red flags

I'd walk away if you hear things like:

• "We can transform your entire plant in six months."
• "Our proprietary Lean methodology..."
• Heavy emphasis on PowerPoint and assessments.
• Lots of certificates but few manufacturing examples.
• No willingness to provide client references.
• They can't quantify previous results.
• They immediately recommend 5S everywhere.
• They talk about Lean primarily as "cost cutting."
• They don't ask about your business strategy.
• They don't spend meaningful time on the shop floor.
• They want your employees to implement their recommendations rather than coaching them.
• They insist you purchase a huge package before demonstrating value.

One particularly important warning: 5S is not a Lean strategy. It's one tool within a broader operating system.

A practical scorecard

I'd score candidates something like this:

Notice that credentials are only 5%.

The person who has personally transformed three plants should beat someone with an impressive collection of certifications but little evidence of implementation.

Where I'd start looking

I'd build a candidate pool from several sources rather than searching Google for "Lean consultant."

• lean.org — particularly useful if you want a Lean/TPS-oriented approach and access to experienced practitioners. LEI explicitly offers organizational coaching, workshops and transformation support.
• asq.org — useful for finding quality/operational-excellence professionals.
• Local manufacturing associations and peer Plant Managers.
• Your customers and suppliers—ask which Lean practitioners they respect.
• Former operations leaders from genuinely Lean manufacturers.
• Your local chapter of a manufacturing/operations professional organization.
• Consultants recommended by other Plant Managers, rather than consultants recommended by consultants.

My preferred approach

If this were my plant, I'd shortlist 3–5 candidates, give all of them the same plant tour and business problem, and ask each for a 90-day pilot proposal.

I'd then choose the person who demonstrates:

"I can improve this process, teach your people how I did it, and leave your management system stronger than I found it." That's much more valuable than someone who can tell you everything that's wrong with your plant.

If you tell me your industry, approximate plant size, number of employees, production type (high-volume/low-mix vs. high-mix/low-volume), and your biggest 2–3 problems, I can also give you a specific consultant-selection scorecard and interview questions tailored to your plant.

My preferred approach

If this were my plant, I'd shortlist 3–5 candidates, give all of them the same plant tour and business problem, and ask each for a 90-day pilot proposal.

I'd then choose the person who demonstrates:

"I can improve this process, teach your people how I did it, and leave your management system stronger than I found it." That's much more valuable than someone who can tell you everything that's wrong with your plant.

If you tell me your industry, approximate plant size, number of employees, production type (high-volume/low-mix vs. high-mix/low-volume), and your biggest 2–3 problems, I can also give you a specific consultant-selection scorecard and interview questions tailored to your plant.

To find a qualified lean manufacturing consultant, look for certified experts with proven shop-floor experience in your specific industry, a strong portfolio of measurable ROI , and a teaching style that aligns with your factory floor culture.

Here is how to strategically source, evaluate, and select the right partner for your facility.

1. Where to Source Qualified Consultants

• Industry Networks: Ask for referrals within groups like the Association for Manufacturing Excellence (AME) or the Society of Manufacturing Engineers (SME).
• MEP Centers: Contact your local NIST Manufacturing Extension Partnership (MEP) center for vetted, state-backed manufacturing consultants.
• Academic Institutions: Check local universities with strong industrial engineering or supply chain programs.
• Niche Firms: Search for boutique operations consulting firms rather than massive, generalized corporate agencies.

2. Key Criteria for Vetting Candidates

3. Essential Interview Questions to Ask

• "Can you share a case study from a plant with a similar production type?" (e.g., discrete vs. continuous process manufacturing)
• "How do you handle resistance from long-term frontline operators and supervisors?"
• "What percentage of your time will be spent on the shop floor versus the conference room?"
• "How do you ensure the continuous improvement culture sustains after your contract ends?"

4. Step-by-Step Selection Process

1. Define Scope: Pinpoint your primary pain points (e.g., high inventory, long changeover times, bottlenecks).
2. Screen Candidates: Narrow your list to 3 consultants based on industry-specific experience.
3. Conduct a Gemba Walk: Invite top candidates to tour your plant to see how quickly they spot waste.
4. Check References: Call past plant managers to verify if the consultant's results lasted long-term.
5. Start Small: Begin with a pilot project, like a single value stream map or a targeted 5S event.

If you would like to narrow down your search, tell me:

• What specific product does your facility manufacture?
• What is your primary goal ? (e.g., reducing lead time, cutting scrap, freeing up floor space)
• What is your approximate location or region?

I can provide more tailored advice or recommend specific regional resources.

Yes. As a Plant Manager, I’d treat this less like “find someone who knows Lean” and more like hire a coach who can change your operating system and develop your people.

The biggest mistake is hiring a consultant who runs a 5-day 5S/Kaizen event, produces a nice before-and-after presentation, and leaves. A strong Lean consultant should help your team solve real business problems, establish daily management, develop problem-solving capability, and sustain the gains after the consultant is gone. That philosophy is also consistent with how the Lean Enterprise Institute describes effective Lean coaching.

1. Start by defining what you actually need

Before interviewing consultants, write down your top 3–5 business problems.

For example:

• OEE is 62% and you need it above 75%.
• Lead time is 18 days and you need it below 10.
• Scrap/rework is 7%.
• On-time delivery is 82%.
• Excess WIP is tying up $2M.
• Supervisors spend their days fighting fires rather than managing.
• Operators aren't consistently following standard work.
• Improvement events happen but gains disappear within months.

Then decide whether you need:

A. Lean implementation

• Value-stream mapping
• Standard work
• Visual management
• 5S
• Kanban/pull
• SMED/changeover reduction
• TPM
• Daily management

B. Leadership transformation

• Leader standard work
• Daily accountability
• A3 problem solving
• Gemba management
• Coaching
• Strategy deployment

C. A combination

For most plants, I'd favor B + A, rather than simply hiring someone to implement Lean tools.

2. Look for these characteristics

Manufacturing experience in your environment

I'd strongly prefer someone who has actually worked inside factories—not someone whose primary experience is teaching Lean certification courses.

Ask:

"What manufacturing environments have you personally worked in?" Then get specific:

• Discrete vs. process manufacturing
• High mix/low volume vs. high volume
• Union/non-union
• Make-to-stock vs. make-to-order
• Automation level
• Quality/regulatory requirements
• Number of employees
• Plant size
• Production complexity

Someone who transformed a 20,000-unit/day automotive operation may not be the right person for a 200-SKU, high-mix industrial plant.

Evidence of sustained results

Don't accept:

"We reduced changeover time by 40%." Ask:

"What happened six and twelve months later?" And:

"Can I speak directly with the plant manager who hired you?" Ideally, references should be from three different engagements, and you should ask the references:

1. What was the consultant actually like on the shop floor?
2. Did operators and supervisors trust them?
3. Did the improvements stick?
4. What did the consultant leave behind?
5. What happened after the consultant left?
6. What would you do differently if you hired them again?

That last question is particularly revealing.

3. Watch how they talk about operators

This is one of my favorite screening tests.

A weak consultant says:

"We need to get operators to follow the new process." A better consultant says something closer to:

"We need to understand why the current process produces the behavior we're seeing and involve the people doing the work in designing the countermeasure." Lean coaching is fundamentally about developing people's ability to identify and solve problems—not simply telling them what to do.

If the consultant spends most of the interview talking about tools, be cautious.

If they spend a lot of time asking about your people, management system, process, customer requirements and business problems, that's a much better sign.

4. Ask them to walk your plant

I'd actually make this part of the selection process.

Invite 2–3 finalists for a half-day diagnostic visit.

Don't give them a PowerPoint presentation first. Let them go to the gemba.

Have them observe:

• Production flow
• WIP
• Changeovers
• Downtime
• Quality problems
• Material movement
• Scheduling
• Operator work
• Supervisor behavior
• Visual controls
• Daily meetings
• Standard work

Then ask:

"What did you see, what do you think is happening, and what would you do first?" You will learn an enormous amount from their answer.

A good consultant shouldn't immediately prescribe 5S, Kanban, or a giant transformation program. They should first establish purpose, current condition, problems and priorities. The Lean Enterprise Institute similarly emphasizes starting with the organization's specific situation and real business challenges rather than applying a generic template.

5. Ask what their first 90 days would look like

This is probably my favorite interview question:

"If we hired you tomorrow, what would you do during the first 90 days?" A good answer might include:

Days 1–30

• Leadership alignment
• Gemba observation
• Current-state assessment
• Baseline KPIs
• Value-stream analysis
• Identify one or two priority problems
• Establish initial management routines

Days 31–60

• Run improvement work on the priority process
• Develop supervisors/team leaders
• Establish daily management
• Begin A3/problem-solving routines
• Measure results

Days 61–90

• Standardize improvements
• Audit/adapt management routines
• Expand to another area
• Develop internal Lean leaders
• Establish the next improvement cycle

The important thing is that capability building happens alongside operational improvement.

6. Be suspicious of these red flags

I'd be cautious if a consultant:

• Promises a specific percentage improvement before seeing your plant.
• Leads with 5S as the primary Lean strategy.
• Talks almost exclusively about certifications.
• Wants to start with a plant-wide rollout.
• Can't provide manufacturing references.
• Won't let you speak directly with previous clients.
• Measures success by the number of Kaizen events completed.
• Produces lots of reports but spends little time on the floor.
• Has no mechanism for sustaining improvements.
• Wants to become permanently embedded in your organization.
• Can't clearly explain how your supervisors will learn to do the work themselves.

The ultimate question is:

"What will my organization be able to do without you after 12 months?" You want a compelling answer.

7. Consider independent consultants as well as large firms

Don't automatically assume the biggest consulting firm is best.

I'd evaluate three categories:

Lean-specialist firm

Usually strongest when you need hands-on plant transformation.

Independent Lean practitioner

Can be excellent if you find someone with deep operational experience and strong references. You may get substantially more senior attention.

Lean institute/recognized organization

Organizations such as the Lean Enterprise Institute can be useful sources of coaching, training and potential contacts. LEI says it has worked with more than 200 organizations and emphasizes developing internal capability rather than simply delivering recommendations.

The Shingo Institute is another useful resource. Its network includes licensed affiliates and experienced practitioners, and Shingo specifically notes that its affiliates can provide support for organizations pursuing its model.

For example, GBMP Consulting Group is a Shingo affiliate focused on Lean manufacturing and Six Sigma.

These aren't necessarily my recommendation for your plant yet—the point is that they give you credible places to start your search.

8. Use a scorecard to select them

I'd score candidates out of 100:

Notice that cost is only 5 points.

A $150K engagement that produces $500K of sustainable annual improvement is cheap.

A $50K engagement that produces $75K of improvements that disappear after six months is expensive.

9. Don't hire them for a two-year transformation on day one

I'd structure the initial engagement around a paid diagnostic + pilot.

Something like:

Phase 1 — Diagnostic: 2–4 weeks Phase 2 — Pilot: 8–12 weeks Phase 3 — Scale: only if the pilot demonstrates results and capability transfer

For the pilot, choose a value stream or production area with enough pain to matter but enough stability that you can learn from it.

Establish baseline metrics before the consultant starts.

Then agree on measurable targets such as:

• OEE
• Throughput
• Lead time
• WIP
• Scrap
• First-pass yield
• Changeover time
• Labor productivity
• On-time delivery
• Safety
• Employee involvement

And critically, define how the gains will be sustained.

10. My interview "killer questions"

If I were the Plant Manager, I'd ask every finalist these exact questions:

1. "Tell me about the most difficult plant transformation you've personally led."
2. "What was the starting condition?"
3. "What measurable results did you achieve?"
4. "What happened 12 months after you left?"
5. "What did you personally do on the shop floor?"
6. "What did the supervisors have to change?"
7. "How do you develop internal Lean leaders?"
8. "What would you look for during your first day in my plant?"
9. "What would you not recommend we do yet?"
10. "How do you prevent Lean from becoming another initiative of the month?"
11. "Show me an example of a transformation that didn't work. What did you learn?"
12. "Give me three former clients I can call."

That last one should be non-negotiable.

---

If you want, I can take this one step further.

If you tell me your industry, approximate plant size/headcount, location, production type (high-volume/low-volume/high-mix, etc.), and your biggest 2–3 problems, I can research and shortlist 5–10 actual Lean manufacturing consultants/firms that would be a good fit, including their manufacturing experience, reputation, geographic coverage, and what I'd ask each one before hiring.

Can be excellent if you find someone with deep operational experience and strong references. You may get substantially more senior attention.

Lean institute/recognized organization

Organizations such as the Lean Enterprise Institute can be useful sources of coaching, training and potential contacts. LEI says it has worked with more than 200 organizations and emphasizes developing internal capability rather than simply delivering recommendations.

The Shingo Institute is another useful resource. Its network includes licensed affiliates and experienced practitioners, and Shingo specifically notes that its affiliates can provide support for organizations pursuing its model.

For example, GBMP Consulting Group is a Shingo affiliate focused on Lean manufacturing and Six Sigma.

These aren't necessarily my recommendation for your plant yet—the point is that they give you credible places to start your search.

8. Use a scorecard to select them

I'd score candidates out of 100:

Notice that cost is only 5 points.

A $150K engagement that produces $500K of sustainable annual improvement is cheap.

A $50K engagement that produces $75K of improvements that disappear after six months is expensive.

9. Don't hire them for a two-year transformation on day one

I'd structure the initial engagement around a paid diagnostic + pilot.

Something like:

Phase 1 — Diagnostic: 2–4 weeks Phase 2 — Pilot: 8–12 weeks Phase 3 — Scale: only if the pilot demonstrates results and capability transfer

For the pilot, choose a value stream or production area with enough pain to matter but enough stability that you can learn from it.

Establish baseline metrics before the consultant starts.

Then agree on measurable targets such as:

• OEE
• Throughput
• Lead time
• WIP
• Scrap
• First-pass yield
• Changeover time
• Labor productivity
• On-time delivery
• Safety
• Employee involvement

And critically, define how the gains will be sustained.

10. My interview "killer questions"

If I were the Plant Manager, I'd ask every finalist these exact questions:

1. "Tell me about the most difficult plant transformation you've personally led."
2. "What was the starting condition?"
3. "What measurable results did you achieve?"
4. "What happened 12 months after you left?"
5. "What did you personally do on the shop floor?"
6. "What did the supervisors have to change?"
7. "How do you develop internal Lean leaders?"
8. "What would you look for during your first day in my plant?"
9. "What would you not recommend we do yet?"
10. "How do you prevent Lean from becoming another initiative of the month?"
11. "Show me an example of a transformation that didn't work. What did you learn?"
12. "Give me three former clients I can call."

That last one should be non-negotiable.

---

If you want, I can take this one step further.

If you tell me your industry, approximate plant size/headcount, location, production type (high-volume/low-volume/high-mix, etc.), and your biggest 2–3 problems, I can research and shortlist 5–10 actual Lean manufacturing consultants/firms that would be a good fit, including their manufacturing experience, reputation, geographic coverage, and what I'd ask each one before hiring.

To find a good lean manufacturing consultant , you should start by leveraging local manufacturing extension partnerships and vetting candidates for hands-on shop floor facilitation rather than just classroom theory.

Where to Look for Lean Consultants

• Manufacturing Extension Partnership (MEP): Check your state's federally funded MEP National Network center. They offer non-biased, affordable, and regional operational assessments.
• Industry Peer Networks: Ask fellow Plant Managers or local chapter members of Association for Manufacturing Excellence (AME) for direct referrals.
• Professional Associations: Search directories via the Society of Manufacturing Engineers (SME) or Shingo Institute affiliates.

Key Criteria for Vetting Candidates

• Learn-by-Doing Approach: Choose consultants who emphasize interactive, gemba-based problem solving and operator training over generic PowerPoint presentations.
• Customization vs. Cookie-Cutter: A strong consultant listens and observes your specific constraints before proposing tools like value stream mapping, 5S, or Kanban.
• Sustainment Strategy: Ask how they ensure your internal team owns and maintains the processes after their contract ends.

If you want, I can:

Provide specific questions to ask during a consultant interview Outline a standard scope of work for a pilot lean project Explain how to connect with your state's local MEP office

• MAGNET: The Manufacturing Advocacy and Growth Network - MAGNET, 1800 E 63rd St, Cleveland, OH 44103, United States
• | Fulcrum ConsultingWorks Inc. - 17204 Dorchester Dr, Cleveland, OH 44119, United States
• NEO Manufacturing Experts - 3436 Grafton Rd, Brunswick, OH 44212, United States
• Manufacturing Resource Network - 662 Lois Dr, Akron, OH 44333, United States
• Linsley Lean Consultants - Beachwood, OH 44122
• River Rock Advisors - 1150 Linda St, Rocky River, OH 44116, United States
• IPE SERVICES - John M. Cachat - 38700 French Creek Rd, Avon, OH 44011, United States
• Sedlak Supply Chain Consultants - 22901 Millcreek Blvd #360, Cleveland, OH 44122, United States
• StonePath Business Solutions - Newark, OH 43055
• cleveland process improvements - 328 Kensington Rd, Cleveland, OH 44116, United States
• Productivity Solutions - 338 Kensington Rd, Rocky River, OH 44116, United States
• The Bilas Group, LLC - 528 Danbury Ln, Avon Lake, OH 44012, United States
• Sum It Ascent, LLC - 14065 Claridon Park Dr, Chardon, OH 44024, United States
• Chagrin River Consulting - 526 Reynolds Ave, Akron, OH 44313, United States
• Mainspring Solutions - 4162 Shurell Pkwy, Medina, OH 44256, United States

Absolutely. The biggest mistake is hiring a consultant who can teach Lean tools but can't help you change the operating system of the plant.

The Lean Enterprise Institute has a useful distinction: you may need someone focused on individual process kaizen, someone capable of improving an entire value stream, or someone capable of leading a broader transformation. Those are very different skill sets.

What I would look for as a Plant Manager

1. Prioritize actual factory results over certifications

A consultant saying "Lean Six Sigma Black Belt" isn't enough.

I'd want to see 3–5 plants where they personally implemented improvements, with numbers such as:

• OEE improvement
• Throughput increase
• Lead-time reduction
• WIP/inventory reduction
• Scrap/rework reduction
• Changeover-time reduction
• Labor productivity
• On-time delivery
• Safety improvements

Ask:

"Show me a plant similar to mine where you personally led the transformation. What were the numbers before, what changed, and what were the results 12 months later?" A good consultant should be comfortable giving you references and letting you speak directly with former clients. LEI specifically recommends checking candidates' previous work and visiting companies where they have worked for a meaningful period.

2. Make sure they actually work on the shop floor

I'd be wary of a consultant whose primary deliverables are:

PowerPoint → assessment → recommendations → report → goodbye.

You want someone who will spend significant time at the gemba with your supervisors, operators, engineers and maintenance people.

They should be willing to:

• Observe the process
• Map material and information flow
• Talk with operators
• Analyze downtime and quality data
• Run kaizen events
• Establish standard work
• Develop daily management
• Coach supervisors
• Help solve real production problems
• Return weeks/months later to see whether improvements stuck

ASQ similarly describes effective Lean consultants as people who can provide strategy, training, key-project leadership and mentoring—not simply recommendations.

3. Look for someone who develops your people

This is probably the most important criterion.

If the consultant leaves and your supervisors say, "Well, the Lean guy isn't here anymore, so we're back to normal," you haven't implemented Lean.

The consultant should progressively transfer capability to:

Plant Manager → managers → supervisors → team leaders → operators.

I'd specifically ask:

"What will my organization be able to do without you after 12 months?" That's a much better question than "How many Lean projects have you completed?"

4. Don't let them start with 5S

5S is useful, but if someone walks into your plant and immediately proposes a giant 5S rollout, I'd ask why.

Start with your business problems.

For example:

"We're missing shipments because our bottleneck work center can't keep up." That might lead to:

Customer demand → takt time → bottleneck analysis → standard work → downtime analysis → changeover → material flow → pull system → daily management.

That's Lean.

Not:

5S → posters → floor tape → Lean boards → certificates.

LEI's guidance emphasizes that Lean isn't a fixed collection of techniques; the consultant needs to understand the specific situation and help people learn how to solve problems.

How I'd run the selection process

I'd shortlist 3–5 consultants and give all of them the same information:

• Plant size
• Number of employees
• Products/processes
• Annual volume
• Major constraints
• Current OEE/throughput
• Lead times
• Inventory/WIP
• Scrap/rework
• Changeover times
• On-time delivery
• Your top 3 operational problems
• What management expects from Lean

Then invite them to spend half a day in the plant.

Don't give them a scripted tour.

Tell them:

"Go see the operation. Talk to people. Then tell me what you think our biggest problems are and how you'd approach the first 90 days." That will tell you an enormous amount.

Score them on these criteria

Don't make price the primary criterion. A consultant who costs $100K and generates $500K+ of sustainable annual improvement can be far cheaper than a $30K consultant who produces little lasting change.

Red flags I'd watch for

🚩 Guarantees a specific percentage improvement before seeing your plant.

🚩 Talks constantly about certifications rather than business results.

🚩 Wants to roll out the same Lean program at every department.

🚩 Can't provide references from manufacturing clients.

🚩 Primarily delivers training.

🚩 Talks more about tools than management behavior.

🚩 Doesn't ask about your customers, demand, constraints or strategy.

🚩 Wants to launch dozens of kaizen events simultaneously.

🚩 Can't explain how improvements will be sustained.

🚩 Doesn't involve supervisors and operators.

🚩 Says Lean is primarily about reducing headcount.

That last one is particularly important. A strong Lean transformation should make the organization better at solving problems and improving flow—not simply turn Lean into a cost-cutting exercise.

If you're in Northeast Ohio

Since you're in the Cleveland area, there are several organizations/consultancies I'd put on an initial research list—not as endorsements, but as candidates to interview and compare.

• MAGNET: The Manufacturing Advocacy and Growth Network — Cleveland's Manufacturing Extension Partnership organization. MAGNET provides manufacturing consulting and operational-improvement services, particularly for small and midsize manufacturers.
• Productivity Solutions — Cleveland/Rocky River-area manufacturing and industrial-engineering consultancy with Lean/Six Sigma, layout, capacity, material-flow and process-improvement capabilities.
• Manufacturer Solutions, LLC — Chagrin Falls-area manufacturing consultant with Lean implementation, quality systems and shop-floor/engineering experience.
• | Fulcrum ConsultingWorks Inc. — Cleveland-area operations consulting firm focused on manufacturing operational excellence and Lean capability-building.
• NEO Manufacturing Experts — Northeast Ohio manufacturing consulting group with Lean/continuous-improvement and manufacturing operations expertise.
• Manufacturing Resource Network — Akron-area manufacturing consulting/interim leadership firm that emphasizes hands-on implementation rather than recommendations alone.
• Linsley Lean Consultants — Beachwood-area Lean/Lean Six Sigma consulting and training provider.

I'd treat that as a starting pool, not a ranking. The right choice depends heavily on your plant's size, industry, production model and current problems.

One more thing: consider a pilot

Rather than immediately signing a 12-month consulting contract, I'd strongly consider a 60–90 day pilot.

For example:

Month 1: Diagnose + establish baseline + select one value stream Month 2: Improve bottleneck/flow + implement daily management Month 3: Stabilize + train supervisors + measure financial impact

Require the consultant to establish baseline metrics before touching the process.

At the end of 90 days you should be able to answer:

"Did this consultant make my plant measurably better, and did my people learn how to continue doing it?" If yes, expand the engagement.

If you'd like, I can also build you a Lean consultant RFP/interview package—including a one-page RFP, 20 interview questions, a weighted scoring sheet, reference-check questions, and a 90-day pilot SOW that you can send to prospective consultants.

Customer demand → takt time → bottleneck analysis → standard work → downtime analysis → changeover → material flow → pull system → daily management.

That's Lean.

Not:

5S → posters → floor tape → Lean boards → certificates.

LEI's guidance emphasizes that Lean isn't a fixed collection of techniques; the consultant needs to understand the specific situation and help people learn how to solve problems.

How I'd run the selection process

I'd shortlist 3–5 consultants and give all of them the same information:

• Plant size
• Number of employees
• Products/processes
• Annual volume
• Major constraints
• Current OEE/throughput
• Lead times
• Inventory/WIP
• Scrap/rework
• Changeover times
• On-time delivery
• Your top 3 operational problems
• What management expects from Lean

Then invite them to spend half a day in the plant.

Don't give them a scripted tour.

Tell them:

"Go see the operation. Talk to people. Then tell me what you think our biggest problems are and how you'd approach the first 90 days." That will tell you an enormous amount.

Score them on these criteria

Don't make price the primary criterion. A consultant who costs $100K and generates $500K+ of sustainable annual improvement can be far cheaper than a $30K consultant who produces little lasting change.

Red flags I'd watch for

🚩 Guarantees a specific percentage improvement before seeing your plant.

🚩 Talks constantly about certifications rather than business results.

🚩 Wants to roll out the same Lean program at every department.

🚩 Can't provide references from manufacturing clients.

🚩 Primarily delivers training.

🚩 Talks more about tools than management behavior.

🚩 Doesn't ask about your customers, demand, constraints or strategy.

🚩 Wants to launch dozens of kaizen events simultaneously.

🚩 Can't explain how improvements will be sustained.

🚩 Doesn't involve supervisors and operators.

🚩 Says Lean is primarily about reducing headcount.

That last one is particularly important. A strong Lean transformation should make the organization better at solving problems and improving flow—not simply turn Lean into a cost-cutting exercise.

If you're in Northeast Ohio

Since you're in the Cleveland area, there are several organizations/consultancies I'd put on an initial research list—not as endorsements, but as candidates to interview and compare.

Finding the right lean manufacturing consultant can make or break your transformation. As a Plant Manager, you need someone who doesn't just hand you a textbook playbook, but genuinely engages your frontline teams and fits your plant's specific culture.

Here is a practical roadmap to sourcing, evaluating, and selecting the best partner for your facility:

- Local MEP (Manufacturing Extension Partnership) centers (every US state has one affiliated with NIST) are often a great, highly vetted starting point.
- Professional networks like the Association for Manufacturing Excellence (AME) or industry-specific peer groups can provide honest referrals.
- LinkedIn searches filtered by "Lean Manufacturing Consultant" combined with your specific sub-industry (e.g., automotive, food processing, medical devices).

- Clarify whether you need a broad cultural transformation (Value Stream Mapping, continuous improvement mindset) or a targeted fix (layout optimization, rapid 5S implementation, reducing setup times via SMED).
- Ensure they focus on sustainable habit-building rather than just quick, temporary metric spikes.[](https://www.gbmp.org/bettereverydayleannews/how-to-choose-a-lean-manufacturing-consultant-what-to-look-for) [[1]](https://www.gbmp.org/bettereverydayleannews/how-to-choose-a-lean-manufacturing-consultant-what-to-look-for)

- Look for direct experience in your specific type of manufacturing environment—a consultant who specializes in high-mix/low-volume job shops operates very differently from one doing high-volume discrete assembly.
- Ask for concrete case studies or references from plants similar in size and union/non-union dynamics to yours.[](https://www.gbmp.org/bettereverydayleannews/how-to-choose-a-lean-manufacturing-consultant-what-to-look-for) [[1]](https://www.gbmp.org/bettereverydayleannews/how-to-choose-a-lean-manufacturing-consultant-what-to-look-for)

- Beware of "cookie-cutter" consultants who try to apply the exact same canned training modules to every single client.
- A great consultant spends significant time listening, observing shop-floor realities, and respecting your people rather than talking down to operators or bypassing supervisors.[](https://www.gbmp.org/bettereverydayleannews/how-to-choose-a-lean-manufacturing-consultant-what-to-look-for) [[1]](https://www.gbmp.org/bettereverydayleannews/how-to-choose-a-lean-manufacturing-consultant-what-to-look-for)[[2]](https://www.gbmp.org/bettereverydayleannews/how-to-choose-a-lean-manufacturing-consultant-what-to-look-for)

- Before signing a massive multi-year contract, hire them for a smaller diagnostic or a pilot project (like a single value stream mapping event or a 3-day 5S blitz).
- Evaluate how well their working style meshes with your leadership team and how quickly they earn the trust of your floor supervisors.

To help narrow down your search, tell me:

• What is your industry and approximate plant size (headcount)?
• Are you looking to fix a specific bottleneck (like lead time or scrap rate) or drive a complete cultural overhaul?