The basic principles of operant and classical conditioning are presented, and their applications for the in-service training of teachers are discussed. Certain classroom behaviors are analyzed and applied to the classic stimulus-response paradigm. Activities are generically classified as positive or negative reinforcers and these reinforcers, in turn, are applied to teaching goals such as student achievement, self-confidence, and self-esteem. In this vein, precision teaching and contingency contracting are presented as teaching systems that use behavioral principles. Related print and video materials are listed and discussed. (JB)