  We investigate the fate of determinism in general relativity (GR), comparing
the philosopher's account with the physicist's well-posed initial value
formulations. The fate of determinism is interwoven with the question of what
it is for a spacetime to be `physically reasonable'. A central concern is the
status of global hyperbolicity, a putatively necessary condition for
determinism in GR. While global hyperbolicity may fail to be true of all
physically reasonable models, we analyze whether global hyperbolicity should be
(i) imposed by fiat; (ii) established from weaker assumptions, as in cosmic
censorship theorems; or (iii) justified by beyond-GR physics.
