First, I will show how Wundt's conception of psychology fits his classification of the sciences in general, as well as his theory of the evolution of knowledge and of experience. Second, I will analyze the division of psychology into two main branches, experimental psychology and Völkerpsychologie, as a further development of his theory of experience. Third, I will demonstrate the continuity between, on the one hand, Wundt's central psychological concepts and principles, and on the other, his logical and epistemological assumptions. Finally, I will discuss Wundt's conception of the will (der Wille) and its role in his psychological project.