A second study was conducted to test further the feasibility of the proficiency module (PM) "Magnetism, Electricity, Heat, and Microscopic Viewing in Science Instruction" constructed for use in an elementary science methods course. (The first study of this PM, SP003965, demonstrated the psychological feasibility of this mode of instruction.) This second study was designed to determine statistically whether significant learning occurs through use of the PM and to further investigate student reactions including types of learning activities each selected. Pretests were administered to the sample, 20 senior women enrolled in Elementary Science Methods. Each was responsible for acquiring each performance behavior (competency) specified in the PM by selecting the learning activities or combination of activities described in the PM which would help him acquire the behavior. Learning activities identified included laboratory activities, reading, small group instruction sessions, and individual help sessions. Posttests were conducted after the 3-weeks' time alloted for the PM. Test results, analyzed using the t test for correlated data, revealed significant change in student performance. Other conclusions: Most students reacted positively to the mode of instruction. The laboratory practicum was selected as the primary learning activity. When given the opportunity, students will select different combinations of learning activities to achieve the same objectives. (JS)