 The motivation for distinguishing between dynamical and value state is the idea that a system may have a sharp value of an observable even if its unitarily evolving state is not an eigenstate of that observable. This thought contradicts the so-called “eigenstate-eigenvalue link”, which says that a system possesses a sharp value of an observable (namely, one of its eigenvalues) if and only if its quantum state is the corresponding eigenstate. The modal approach accepts the “if” part, but denies the “only if” part of this statement. Van Fraassen accordingly introduced the notion of “value state”: a system’s physical properties (the sharply defined observables) are not one-to-one represented by the dynamical state, which occurs in the evolution equation, but by the value state, which typically differs from the dynamical state.