Provided is an overview of the analytical method known as structuralism. The first chapter discusses the three key components of the concept of a structure: the view of a system as a whole instead of so many parts; the study of the transformations in the system; and the fact that these transformations never lead beyond the system but always engender elements that belong to it and preserve its laws. Subsequent chapters illustrate this concept as it appears in mathematics and logic (group theory, general algebra); physics and biology (structural models of causality, homeostasis); psychology (the laws of Gestalt, the structure of intelligence); linguistics (synchronics, generative grammars); social sciences (analytic, global and anthropological structuralism); and philosophy (dialectic, epistemology). In addition to his own work, Piaget explains and evaluates that of such figures as Nicholas Bourbaki, Noam Chomsky, Michel Foucault, Kurt Godel, Immanual Kant, Wolfgang Kohler, Claude Levi-Strauss, Karl Marx, Ferdinand de Saussure, and H. Sinclair de Zwaart. A final chapter summarizes the history and theses of structuralism, and estimates the future contribution of this method. (MM)