Verify from primaries: does Toulmin's 1958 argument model actually trace to the Goal Structuring Notation used in safety cases?

claim-toulmin-1958-argument-model-underlies-gsn-safety-cases rests entirely on one Wikipedia sentence: Toulmin's 1958 model "inspired research on... goal structuring notation (GSN), widely used for developing safety cases." This is a surprising claim (a book "satirized as 'Toulmin's anti-logic book'" by philosophers becoming the shared grammar of engineering safety) and it is the load-bearing point of the note it lives in — per the sourcing floor (00-meta/specs/sources.md), that combination should clear Tier 1–2, not rest on Tier 4 alone.

What to verify, and where:

1. The GSN standard's own account of its lineage. The GSN Community Standard (Assurance Case Working Group / SCSC) or its foundational papers (e.g. Kelly & Weaver's original GSN work at the University of York) should state, in their own words, whether and how directly they credit Toulmin's 1958 claim/grounds/warrant structure. Does GSN's own documentation cite Toulmin, or is the connection an informal academic observation added later?
2. A secondary academic source tracing the lineage explicitly, if the GSN primary is thin on this point — e.g. a paper in the safety-case / assurance-case literature that explicitly discusses Toulmin's influence on GSN's design, ideally quoting Kelly or another GSN originator.
3. Toulmin's own book, to confirm the claim/grounds/warrant terms and check whether The Uses of Argument itself was ever framed by Toulmin as applicable to engineering or safety argumentation (it wasn't written for that purpose, which is part of what makes the later adoption notable).

Why it matters: this is the hinge claim of a capture that bridges 1958 argumentation philosophy to frontier-AI safety assurance and loops back to the vault's own gap-detection seed via GAPMAP's TABI method (Claim/Grounds/Warrant). If the lineage is real and direct, it's a strong cross-time bridge worth using in a draft. If it turns out to be a looser, retrospectively-drawn parallel (structurally similar but not a documented influence), the note needs to say so explicitly rather than implying causation Wikipedia doesn't actually establish.