Group Investigation - a method for classroom instruction in which students work collaboratively in small groups, and take an active part in establishing their learning goals - continues to gain popularity. With increased interest has come the need for a comprehensive work on the subject - a thesis, a research review, and handbook. In this book, the authors provide an explanation of the philosophy, foundations, and current practice of Group Investigation. The authors give suggestions for ways of developing in a class the necessary discussion and cooperative skills, as well as detailed examples of projects in elementary and upper grades. In addition, they examine the experimental evidence of the method's effectiveness. The Sharans conclude with a presentation of two training programmes, one for teachers applying Group Investigation for the first time, and the other for those with some experience in cooperative learning who wish to expand and refine their techniques.