A discussion is presented on classroom learning centers specifically designed to teach a concept, a unit, or a larger part of the curriculum. The four basic types of learning centers (diagnostic, enrichment, motivational, prescriptive) are described. Examples are given of how learning centers may vary, depending upon their objectives, and a variety of reasons why learning centers are used are cited. The question of where learning centers are used is considered with reference to space, size, and flexibility of the school, and cooperation by teachers where team teaching is accepted. The six ingredients of a typical learning center are delineated: (1) specific objectives; (2) step-by-step directions for activities; (3) a pre-test to determine the learner's general level of knowledge; (4) the activity or presentation of materials; (5) the post-test; and (6) keys to the two tests for evaluation purposes. Advantages of the learning center approach to teaching are pointed out in terms of how it improves teacher effectiveness. The five acts of individualized instruction are described: (1) listening; (2) observing; (3) diagnosing; (4) prescribing; and (5) evaluating. (JD)