A comparison of several major learning taxonomies produced a three dimensional taxonomy of learner involvement on the mental, social, and physical dimensions. The six hierarchical levels of the mental dimension--recording, reacting, interpreting, analyzing, evaluating and applying, and synthesizing--indicate a synthesis of cognitive, affective, and some psychomotor elements. The social levels--aggregrate, individual, and group--are further subdivided into silent or vocal/verbal interactions with others. The physical dimension, indicating the extent of muscle use during learning activities, moves from (1) the small muscles like the eyes and lips to (2) motion focused in the extremity of the body, then (3) movement located in a part of the body, and finally to (4) activities requiring coordination of total body movement. By providing a clearer understanding of what various assignments demand of students, the cubic taxonomy assists in the designing, sequencing, and assessment of teaching activities. Preliminary research indicates that the three dimensions are valid in classroom and job interview situations. (Appended are a table comparing various taxonomies, graphs of the cubic taxonomy, and an exercise in using the taxonomy to evaluate classroom speech assignments.) (MM)