Time and Structure in Canonical Gravity.1

In this paper I wish to make some headway on understanding what kind of problem the “problem of time” is, and offer a possible resolution—or, rather, a new way of understanding an old resolution.2 The response I give is a variation on a theme of Rovelli’s evolving constants of motion strategy (more generally: correlation strategies). I argue that by giving correlation strategies a structuralist basis, a number of objections to the standard account can be blunted. Moreover, I show that the account I offer provides a suitable ontology for time (and space) in both classical and quantum canonical general