SummaryIn numerous writings Philip Kitcher argues against the thesis that understanding nature or searching for truth in general are goals that are shared by all the sciences. Neither do the sciences aim for common distinctive truths, such as natural laws. Thus, the question is: can the sciences be characterized as sciences by one of their goals? According to Kitcher this seems possible. The sciences, so he claims, aim for unification. In this paper I shall argue that unification should not be understood as an aim but rather as a method the sciences use depending on the specific problems they pursue. Therefore, it seems, there is not one goal for all the sciences.