In Chapter IV, discussion centers upon the development of listening and looking as processes for scanning information in acoustic or optic displays so that selected information relevant to a person's current cognitive demands might be extracted. The emergence of auding as a special type of listening, and reading as a special type of looking are discussed, and similarities and differences between auding and reading are described.

In Chapter V, emphasis shifts from the explication of concepts in the model, to the survey of literature bearing on four hypotheses deduced from the model. Finally, Chapter VI presents a summary and discussion of the findings of the literature survey, and presents recommendations for future research and/or development efforts to improve the teaching of auding and reading, and for improving learning from spoken or written language displays.