This document discusses strategies for teaching concepts. It defines concepts as categories of stimuli that share common features. There are two main types of concepts: concrete concepts, which involve physical characteristics like sight and touch, and abstract concepts, which are defined but not physical, like profit or norms. The document outlines two main strategies for teaching concepts: inquiry, which uses examples and non-examples, and expository, which presents the concept label and criteria. It notes both strengths, like helping with complex topics and building learning skills, and challenges of concept learning, such as overgeneralization, under-generalization, and misconceptions.