The new Lite Version of the famous Sniffy software simulates the elementary phenomena of operant and classical conditioning that are discussed in courses on the Psychology of Learning and in Introductory Psychology courses. Sniffy, a realistic digital rat in an operant chamber (Skinner Box), gives students hands-on experience setting up and conducting experiments. Users begin by training Sniffy to press a bar to obtain food and progress to studying reinforcement schedules and simple classical conditioning. In addition, a series of "Mind Windows" enable students to visualize how Sniffy's experiences in the Skinner Box produce the psychological changes that their textbooks discuss in connection with the phenomena simulated. The Sniffy, Lite Version CD-ROM comes packaged in the front of a brief, hands-on Lab Manual that walks users through the steps that they need to follow to set up a wide variety of operant and classical conditioning experiments that closely resemble experiments discussed in learning texts.