This document discusses curriculum theory, including definitions of theory, sources of theories, and functions of theories. It provides an overview of the historical development of curriculum theory from the early 20th century to current approaches. Key figures and their contributions are outlined, such as Bobbitt, Rugg, Dewey, Tyler, Eisner, and Pinar. Different theoretical camps like traditionalists, conceptual empiricists, and reconstructionists are also summarized. The document concludes by discussing aims, goals, and objectives in curriculum and sources that have influenced them over time.