FPF Reference

    SYSTEM-DELIMITATION — Separate parts, selected boundary, and crossings

    Preface node heading:system-delimitation-separate-parts-selected-boundary-and-crossings:631

    What this page is

    This is generated FPF reference text from the specification preface or supporting sections. It helps interpret FPF; it is not FPF Reference product documentation.

    Methodology

    Use it to understand how the specification wants to be read, then return to a route, pattern, or work packet for active work. Cite generated IDs only when the wording changes the task decision.

    Content

    • 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 honest 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.

    Last Updated: 2026-09-03 — upstream FPF commit b999972c (github.com/ailev/FPF)