This yearbook presents theories of learning, discusses the research on which they are based, and suggests ways to apply these theories to concrete learning situations. After an introduction to the more prominent theories in chapter 1, the remaining chapters present more specific areas and questions. The next three chapters deal with motivation, concept formation, and sensory learning, respectively. Discussed in chapter 5 is the correct use of language in mathematics; the following chapter provides suggestions for the use of drill and practice. Transfer of training and problem solving are the two important issues presented next. The last three chapters are on individual differences, planned instruction, and improving instruction. Most chapters have a bibliography. (LS)