KnowraWigner’s friendLinked fromLinked fromThe 8 pages that link to Wigner’s friend, each with the reason it gives.All 8Broader topic 5Related 3Quantum measurementRelated: It asks whether different observers can consistently assign outcomes and quantum states.Schrödinger’s catRelated: It extends the measurement puzzle to observers who disagree about whether an outcome is definite.Wave function collapseRelated: It exposes disagreement over whether collapse depends on an observer's perspective.