Four Programing systems--Mentor, Stringcomp, Simon, and Logo--were designed and implemented as integral parts of research into the various ways computers may be used for teaching problem-solving concepts and skills. Various instructional contexts, among them medicine, mathematics, physics, and basic problem-solving for elementary school children, were used to investigate new lines of approach to programed teaching, programing, and instructional monitoring. The results suggest valuable contributions which computer-aided instruction may make to education. The comprehension of programing languages apparently provides a basic framework for the study of mathematics, and practical subjects (navigation, languages, music) whose mastery requires the integration of mechanical and intellectual skills may be effectively taught with instructional monitors utilizing diagnostic cues. Diagrams, sample programs, and explanations of programing logic are included. (SH)