The purpose of this bulletin is to help the teacher derive the full value from the classroom test as an important educational tool. Principles of good test construction are explained and illustrated. Concrete examples of good procedure and poor procedure are offered. A checklist is presented of the salient points to keep in mind when preparing a test. No consideration is given in this bulletin to the curricular implications of classroom tests, vital as they are. The special concern of this bulletin is not "what to test", but rather "how to test." (RC)