This document defines models of teaching as instructional designs that specify environmental situations to cause student interaction and behavioral change. A model of teaching consists of guidelines for designing educational activities and environments to achieve instructional goals. The document discusses the assumptions, functions, elements, features, and families of models of teaching, noting they help teachers plan activities and curriculum according to learning outcomes, environment, and performance criteria. Models are classified into information processing, social, personal, and behavioral systems families based on psychological learning theories and instructional goals.