Which metric should a developer track to assess the quality of wca4z-generated Java before accepting it?

Think of it like working hands-on with IBM mainframe systems — the answer here is 'The percentage of COBOL business rules that have identifiable equivalents in the generated Java and pass equivalence tests'. Tracking the percentage of COBOL business rules that have verified Java equivalents passing equivalence tests directly measures how faithfully the transformation preserved the original business logic. On real mainframe exams, this concept comes up repeatedly so make sure you have it locked in.