THIS PAPER DESCRIBES THE RULEG PROGRAM SYSTEM, WHICH IS BASED ON THE PREMISE THAT THE VERBAL STATEMENTS OF A PROGRAM CAN BE CLASSIFIED INTO "RU'S" (RULES) AND "EG'S" (EXAMPLES). ALL RU'S ARE STATEMENTS OF SOME GENERALITY, FROM WHICH SUBSTITUTION INSTANCES, OR EG'S, CAN BE OBTAINED. 12 STEPS FOR THE CONSTRUCTION OF RULEG PROGRAMS ARE LISTED--SPECIFY THE CRITERION BEHAVIOR, WRITE DOWN MANY RU'S, COLLECT STIMULUS SUPPORT, ORDER THE RU'S, MAKE A RU MATRIX, CONSTRUCT EG'S, NUMBER THE MATRIX CELLS, ASSEMBLE RU'S AND EG'S INTO FRAMES, AND THE FRAMES INTO A PROGRAM, PRE-TEST AND THEN REVISE THE PROGRAM UNTIL RELIABLE CRITERION BEHAVIOR IS ACHIEVED. (LH)