PSDA.2:1.1 - Working Distinctions
| Working term | Meaning in this pattern |
|---|---|
| engagement boundary | The PSDA.11 boundary around the decision-support return, recipient, subject, horizon, receiving use, and authority. |
| problem boundary | The provisional cut that determines which formulations, bearers, concerns, relations, conditions, horizons, evidence, and intervention families are treated as material now. |
| material exclusion | An omitted or deferred item that could change the current result and therefore must remain visible with a reason, uncertainty, and reopen condition. |
| usable scope | The smallest current problem boundary adequate for a named next result and its assurance burden. It need not be exhaustive or permanent. |
| reopen basis | An observable change or newly recoverable value that can make the current boundary too narrow, too broad, or otherwise unfit for the receiving use. |
U.Scope | A declared scope for exact U.ContextSlice membership, governed by A.2.6. An ordinary problem boundary need not be reified as one. |
Every formulation makes a cut. It foregrounds some participants, Systems, concerns, causal or modal paths, operating conditions, time horizons, evidence, and intervention families while leaving others outside. In ill-structured situations those cuts are often contested and revisable rather than simply discovered.
The primary concern is not to find the one true perimeter. It is to choose and expose a boundary adequate for one receiving use while preserving the exclusions and observations that could require revision. Recognition can begin with one plausible boundary reversal. Consequential inclusion, exclusion, relation, harm, authority, legal, ethical, safety, or factual claims retain their direct assurance.