The discovery method, according to the author, promotes logical thinking, is motivational in nature, makes learning more permanent, produces more usable knowledge, and gets students actively involved. A discovery lesson is characterized by the following: (1) the concept to be learned is not announced, (2) experiences and activities are developed which involve the concepts to be learned, (3) the ideas are given names, (4) definitions are generated, (5) pupils are actively involved, (6) practice experiences are provided and disguised to some extent, and (7) questions are raised to provoke additional thought. These points are illustrated with an example discovery lesson on prime numbers. (JG)