The aim of this book is to discuss the notions of self-concept, self-esteem, and related terms from an educational and psychological perspective. Specifically, this book is concerned with developing a model of self-concept -- and corollaries to this model -- that assesses the dimensionality of self-concept, reviews tests of self-concept, discusses the relationship between self- concept and other variables (particularly achievement), describes the development of self-concept, and evaluates programs to enhance self-concept. Throughout this volume, emphasis is placed on ordering the many studies using recent methodological advances such as meta-analysis and the analysis of covariance structures. After detailing a conceptual model of self-concept, the book offers various experimental and statistical discussions of the model. Unlike many other models, the claim is not that this model is the correct one but that it may serve as a useful coathanger until a better one is devised.