{"id":"facade-often-singleton","text":"Usually only one Facade object is needed for a subsystem, and it is often implemented as a Singleton.","truth_value":"IN","source":"entries/2026/06/17/gof-oo-chunk-13.md","source_url":"","source_hash":"","justifications":[],"dependents":["facade-asymmetric-subsystem-simplification","singleton-as-cross-category-enabling-infrastructure","singleton-cross-category-sharing-infrastructure","singleton-pervasive-instance-governance-across-categories"],"metadata":{"last_premise_reviewed":"2026-06-17T18:19:22","premise_review_result":"pass"},"created_at":"2026-06-17T21:30:27+00:00","updated_at":"2026-06-17T21:30:27+00:00","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"facade-often-singleton","truth_value":"IN","reason":"premise"}]}}