This study dealt with the construction of an observation instrument for instructional cues. Cues are defined as a complex of instructions, methods, and conditions by which students both learn the material and learn to apply the material. As part of the "Classroom Environment Study: Teaching for Learning," the pilot study began a review of the relevant literature to aid in the development of a list of cues, which were placed into a category system. A tentative list was assessed by observers watching audiotaped micro-teaching situations and mathematics and physics lessons. Some problems were resolved by adding items; others required better operationalization of cues. Remaining problems with the observational instrument will require: (1) establishing an instrument for which the description of the categories and the choice of items are based on the agreement of a larger sample of judges; (2) establishing an instrument that can be used in a variety of classroom situations and for a variety of instructional methods; (3) gaining information about what instructions and practices should be contained in an observers' manual; and (4) making the observation suitable for construction of better scales for the variables. If possible, interval scales should be developed. A list of cues, descriptions of the classification categories, and the instrument are appended. (TJH)