Summary: In "Piaget and Knowledge" by Hans G. Furth, the text explores the theoretical foundations of Piaget's work in psychology, emphasizing the interdisciplinary nature of psychological research. It delves into the links between biology, reason, and epistemology, highlighting the importance of biological considerations in understanding cognitive functions and their development. Furth contrasts Piaget's views with prevailing theories of learning, stressing the role of biological structures, epigenetic constructions, and progressive self-regulation in the development of intelligence. The text also discusses the relationship between language, symbolic function, and intellectual development, questioning conventional views and emphasizing the role of language in cognitive processes. The interdisciplinary effort and collaboration between biologists, psychologists, and epistemologists are underscored as essential for scientific epistemology. The text concludes by emphasizing Piaget’s revolutionary impact and the need for a comprehensive understanding of his theoretical framework to grasp the essence of human intelligence and development.