modernize-extract-rules

Extracting business rules from legacy code involves applying three parallel viewpoints—calculations, validations, and state transitions—to synthesize structured, testable rule cards and a data object catalog.

Modernizing legacy code into testable specifications is best achieved by mining coupled logic through three parallel extractors, producing standardized Rule Cards and a DTO catalog for automated testing and governance.

Identify calculations and validations in legacy modules by applying parallel extraction viewpoints that target pricing logic, eligibility checks, and workflow transitions, then deduplicate findings into structured rule cards.

Yes, you can generate a data object catalog alongside business rule extraction; the process outputs a DTO catalog at analysis/$1/DATA_OBJECTS.md while synthesizing structured rule cards for the extracted logic.

You need to extract state and lifecycle rules from legacy code when modules contain coupled workflow logic, enabling automated testing and governance by transforming transitions into clear, testable rule specifications.

Yes, this rule extraction approach supports automated testing by mining complex legacy paths and producing structured Rule Cards in a standardized format, separating calculations, validations, and state transitions for governance.