This document discusses definitions of theory from various sources and defines educational theory. It explores approaches to educational theory, including the relationship between theory and practice/philosophy. Descriptive and prescriptive theories are examined. School administration and instructional theory are provided as examples of developing sub-theories within educational theory. The role of theorists and practitioners is addressed, as well as conflicts that can arise between them. Overall the document outlines the development of educational theory through examining definitions, approaches, and examples of sub-theories.