When discussions of scientific method shift from natural sciences to social sciences, we tend to feel that we are turning from strict sciences to subject matters which may have achieved some measure of intellectual competence but which lack the rigor, objectivity and principles of organization found in mature science. This sense of a difference between the natural sciences and the social sciences is connected with questions of the meaning and rôle of laws. To the extent to which social and historical events have not been reduced to laws or perhaps cannot be, the disciplines which study such events are considered immature or imperfect sciences. To the extent to which social sciences do not offer predictions, they are felt to have little application to the solution of actual and immediate problems. When a bridge has to be built over a chasm, the laws of the natural sciences can be brought to bear. But when a treaty is to be drawn, where, it is asked, are the social and historical laws which can be applied to the situation?