  The development of quantum cosmology, in which Stephen Hawking played a
crucial role, has frequently encountered substantial conceptual and technical
difficulties related to the problem of time in quantum gravity and to general
issues concerning the foundations of quantum theory. In this contribution to
Stephen's 60th Birthday Conference, I describe some recent work in which the
decoherent histories approach to quantum theory is used to quantize simple
cosmological models and perhaps shed some light on some of these difficulties.
