This report in the National Education Association's "Developments in Classroom Instruction" series presents seven detailed descriptions of models for elementary-level classroom learning centers. It presents lists of materials, suggestions for the placement of equipment, study plans, and evaluation guides for learning centers in a variety of subject areas. The subject areas include microscopes, telling time, China, adjectives, human awareness, mathematics, and economics. Detailed illustrations support the descriptions of each learning center with renderings of spatial placement. The report also contains a general discussion of learning centers which focuses on their effectiveness in learning and teaching. This is followed by suggestions on establishing and using learning centers. A short annotated bibliography is also included. (CD)