The principles Vico offers for his science indicate that his conception of his science is flawed and inconsistent. But this does not mean his conception of explanation is inadequate and inconsistent. Vico's method of science contains three different perspectives which can be called the providential, institutional, and ideational perspectives. Vico does distinguish between description and explanation and the providential perspective involves the former. Explanations of the world of nations are made by looking at institutions and ideas. The institutional perspective aims at knowledge of what is true of things while the ideational perspective studies human thoughts. They are associated with the disciplines of philosophy and philology. These disciplines do complement each other; they are both concerned with ideas and institutions. The complementary workings of these perspectives in producing explanations can be understood in terms of a Vichian explanatory circle.