  We describe a method for constructing simplicial model structures on ind- and
pro-categories. Our method is particularly useful for constructing "profinite"
analogues of known model categories. Our construction quickly recovers Morel's
model structure for pro-p spaces and Quick's model structure for profinite
spaces, but we will show that it can also be applied to construct many
interesting new model structures. In addition, we study some general properties
of our method, such as its functorial behaviour and its relation to Bousfield
localization. We compare our construction to the infinity-categorical approach
to ind- and pro-categories in an appendix.
