 The quantum theory has no explicit dynamics; wavefunctions are annihilated by the constraints and Dirac observables commute with the constraints and hence are constants of motion.Kuchar introduces the idea of "perennials" and Rovelli the idea of "partial observables".The expectation is that in physical situations some of the variables of the theory will play the role of a "time" with respect to which other variables would evolve and define dynamics in a relational way.