The development of an instrument for evaluating cognitive growth in preprimary children by means of observational techniques is reported. Areas of growth in pre-mathematic skills were defined for this purpose as: Imitating, recognizing, classifying, matching, comparing, understanding, counting, computing, and measuring. Each is described, and illustrated. Symptoms of gowth in each of the areas are listed and guides for determining this growth in a child are provided. The inventory can be used as a class record or as an individual profile for the recording of positive observations of symptoms of pre-mathematics skills. Teachers note, record, and date observations of preprimary children as they show developmental progress. The inventory can be used as an aid in observing beginning first graders, prekindergarten, or kindergarten children for mathematics readiness. (TA)