{"id":"gof-observer-abstract-coupling-subject-observer","text":"The Observer pattern provides abstract and minimal coupling between Subject and Observer: a subject only knows it has a list of observers conforming to the abstract Observer interface, not their concrete classes.","truth_value":"IN","source":"entries/2026/06/17/gof-oo-chunk-19.md","source_url":"","source_hash":"","justifications":[],"dependents":["abstract-coupling-enables-pattern-flexibility","observer-reliable-notification-system"],"metadata":{"last_premise_reviewed":"2026-06-17T18:19:22","premise_review_result":"pass"},"created_at":"2026-06-17T17:04:08+00:00","updated_at":"2026-06-17T17:04:08+00:00","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"gof-observer-abstract-coupling-subject-observer","truth_value":"IN","reason":"premise"}]}}