THE AUTHOR EXAMINES THE DISPLAY AND RESPONSE CHARACTERISTICS BY WHICH A STUDENT CAN INTERACT WITH A SUBJECT-MATTER DISCIPLINE. THIS DOCUMENT IS A REVISION OF A REPORT ISSUED UNDER THE SAME TITLE IN 1964 (ED 003 167). THE TERM "INTERFACE" IS USED TO REPRESENT THE DISPLAY MEDIA AND CONTROLS WITH WHICH THE STUDENT HAS DIRECT CONTACT. THE DISPLAY CONSISTS OF INFORMATION INPUTS TO HUMAN SENSORY CHANNELS. THE CONTROLS CONSIST OF TRANSDUCERS FOR CONVERTING HUMAN RESPONSES SO THEY CAN BE DETECTED. CHAPTER 1 INTRODUCES THE PROBLEM, ITS BACKGROUND, AND THE APPROACH TAKEN. CHAPTER II CONSIDERS HOW SUBJECT-MATTER PROPERTIES AND REQUIREMENTS FOR LEARNING CAN IMPOSE CONDITIONS UPON THE DESIGN OF AN INSTRUCTIONAL INTERFACE. CHAPTER III REVIEWS PHYSIOLOGICAL AND HUMAN FACTOR CONSIDERATIONS RELATED TO VISUAL AND AUDITORY INFORMATION CHANNELS AND RESPONSE OUTPUTS, BUT IS PRIMARILY CONCERNED WITH THE TECHNIQUES AVAILABLE FOR USING THESE HUMAN CAPABILITIES IN THE EDUCATIONAL ENVIRONMENT. PRESENTLY AVAILABLE DEVICES, TECHNICALLY FEASIBLE DEVICES, AND POTENTIALLY AVAILABLE DEVICES ARE CONSIDERED. CHAPTER IV PRESENTS (1) THE GOALS AND TASKS OF THE RESEARCH AND DEVELOPMENT NEEDED TO FOLLOW UP CONCEPTS DISCUSSED IN THE FIRST THREE CHAPTERS, (2) THE SPECIAL PROBLEMS THAT CAN BE INVESTIGATED, (3) THE TYPE OF INTERFACE EQUIPMENT INDICATED BY SUBJECT-MATTER CONSIDERATIONS AND INSTRUCTIONAL REQUIREMENTS, AND (4) OVERALL CONSIDERATIONS WITH RESPECT TO COMPUTER AND INSTRUCTIONAL PROGRAMING. (AL)