Each of the teaching machine curriculums developed, so far, embody only one of the several schools of psychological methodology currently known to the practitioner. It is held that machine design is one factor which acts as a constraint. The general teaching machine environment in terms of a man-machine relationship is defined and ten different modes of the “ learner-teaching machine” relationship are delineated. A. typical aural-visual teaching machine for curriculum research purposes is graphically described along with information relating to magnetic tape multi-channel assignments and a punched paper tape scoring device.