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Library / First Principles Framework (FPF) - Core Conceptual Specification
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SYSTEM-DELIMITATION — Separate parts, selected boundary, and crossings

  • Situation: One System is recognized, but a decision mixes its parts and assembly with a chosen boundary, external participants, and relations that cross it.
  • Question: Which facts, use-relative choice, crossings, and selected structure answer the decision?
  • First useful result or blocker: One exact part or assembly fact, boundary choice, crossing relation, selected structure, or missing participant, predicate, constraint, or use.
  • Mantra: Start with the recognized System and decision. Recover parts and assembly as facts; keep external participants outside the part list; choose a boundary only when alternatives matter; name every crossing by its own relation; select a joint structure only when organization changes the decision; reopen when identity, facts, use, crossings, or constraints change.
  • Start with: B.1.2, A.14, and C.13; use C.11, C.32.PAD, the direct relation pattern, or A.22 only when needed.
  • Stop or return: Stop at the smallest result answering the decision. If system recognition is unresolved, return to A.1.SCR.