Karen Pryor wrote the excellent training book Don’t Shoot the Dog: The New Art of Teaching and Training (Ringpress Books, 3rd ed., 2002, ISBN-13: 978-1860542381) that explains the tenets of operant conditioning. This is the basis of “clicker training,” which differs in a number of ways from standard or traditional dog training. “First, although we often use food as a primary reinforcer, we use no deprivation,” writes Pryor. “Second, we use no punishment within the shaping. Third, the sessions are very brief.” Pryor offers clicker training supplies and instruction books for sale on her site as well as basic clicking lessons for free.