Phase Change SoftwarePhase Change offers COBOL Colleague, a deterministic AI-driven knowledge assistant that extracts the business functionality from legacy COBOL code and converts it into a structured knowledge graph and up-to-date documentation. It surfaces business rules, data flows and transformations, enables onboarding, modernization, testing, and compliance, and provides searchable navigation to stakeholder-accessible insights. The platform is designed for enterprises to analyze, maintain, integrate, or modernize mainframe COBOL applications with precise AI reasoning and confidence.