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The classical theory persisted for so long unquestioned because it seemed intuitively correct and has great explanatory power. It can explain how concepts would be acquired, how we use them to categorize and how we use the structure of a concept to determine its referent class.[3] In fact, for many years it was one of the major activities in philosophy—concept analysis.[3] Concept analysis is the act of trying to articulate the necessary and sufficient conditions for the membership in the referent class of a concept.[citation needed] For example, Shoemaker's classic "Time Without Change" explored whether the concept of the flow of time can include flows where no changes take place, though change is usually taken as a definition of time.[citation needed]