This paper provides an orientation to learning centers for middle school teachers. A description is given of the characteristics of a learning center and the kinds of student activities that can best be conducted in an area set apart for individual or small group projects. Benefits from using learning centers, are cited, such as added variety to the classroom routine, enriched instructional activities through visual, auditory, and tactile senses, and encouragment of student motivation and independence. Various uses of learning centers are suggested, including developing specific skills, enriching the existing school curriculum, and providing opportunities for students to explore their own interests. Specific planning concerns in the preparation of a learning center are discussed, focusing on selecting the appropriate type of learning center, specifying objectives, deciding about space and design, acquiring materials, and selecting student groups and learning activities. A bibliography of 50 items on learning centers is included. (JD)