%0 Journal Article %T Model structures on pro-categories %A Halvard Fausk %A Daniel C. Isaksen %J Mathematics %D 2005 %I arXiv %X We introduce a notion of a filtered model structure and use this notion to produce various model structures on pro-categories. This framework generalizes several known examples. We give several examples, including a homotopy theory for $G$-spaces, where $G$ is a pro-finite group. The class of weak equivalences is an approximation to the class of underlying weak equivalences. %U http://arxiv.org/abs/math/0511057v1