The Answerability Problem in Quantum Mechanics: Observation, Interpretation, and Structural Closure Under Constraint

This paper presents a philosophical analysis of quantum mechanics, the measurement problem, the observer problem, decoherence, and quantum interpretation. It argues that the central difficulty in quantum mechanics is not only technical but interpretive: the theory has extraordinary predictive power without a single settled account of what is happening physically or ontologically. The paper frames this as an answerability problem, asking how interpretations should be judged when formal success outruns explanatory closure. It separates several meanings of observation—interaction, coupling, record formation, information update, and conscious awareness—and shows how collapsing these layers creates confusion in both physics and philosophy. It then compares major interpretations including Copenhagen, Many-Worlds, Bohmian mechanics, objective collapse, QBism, relational quantum mechanics, and consistent histories, treating them as different ways of stabilizing explanatory burden around an underconstrained formal core. The paper also argues that decoherence is crucial for understanding record stability and the appearance of classicality, but does not by itself solve the single-outcome problem. Overall, the paper offers a clear framework for thinking about quantum foundations, scientific explanation, ontology, observation, and philosophy of science without overstating what current theory can responsibly claim.