fpf.tools
Library / First Principles Framework (FPF) - Core Conceptual Specification
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C.16.Q:4.6 - Functional vs quality-family discipline

C.16.Q SHALL prevent the collapse of function or capability claims into quality-family claims.

  • A statement about what a system does uses A.6.F first when function-like wording hides the FPF kind, relation, or claim, then applies the pattern for the recovered capability, Method, Work, system-role kind or assignment, A.6.M module-interface, architecture, mathematical, evidence, assurance, gate, decision, or release claim.
  • A statement about how well, how safely, how robustly, or how maintainably it does so belongs to QS.EngineeringQualityFamily.
  • “Quality characteristic” and “functional characteristic” SHALL NOT be used as interchangeable labels.
  • In engineering contexts, -ility names are quality-family labels, not automatically Characteristics. They become admissible only as one explicit U.Characteristic or one explicit Bundle (preferably expressed through Q-Bundle when composite).
  • Cross-references are allowed; category collapse is not.