This thematic issue is made up of papers by practicing administrators and university personnel on the topic of cooperative learning. The following articles are included: (1) "The Cooperative Learning Environment: Restructuring without Rebuilding" (Harvey C. Foyle and Lawrence Lyman); (2) "The Role of the Administrator When Adopting Cooperative Learning as an Innovation in School Improvement" (Gerald D. Bailey and Norma Dyck); (3) "Administrative Concerns with the Implementation of Cooperative Learning" (Dan R. Flummerfelt); (4) "Using Cooperative Groups in the Teacher Education Classroom" (Thomas O. Erb); (5) "Jigsaw with Mature Students" (William Samuelson); and (6) "How Do You Evaluate Students Working in Cooperative Learning Groups?" (John Myers and Jackie Dippong). (JD)