Observer Pattern / Ordering
Kind: tension
Record: tension:observer-pattern-ordering
Canonical: Schema
"observer-pattern" (design-patterns-core layer) is traded against "Ordering" (causality-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Ordering" and choosing an explicit operating point.
Listed in Tensions, after Template Method Pattern / Inheritance Coupling and before Observer Pattern / Debuggability.