By using this instructional module the participants should be able to: (1) predict the behavior of two magnets prior to their being placed close to each other; (2) identify and describe the magnetic forces acting on a bar magnet that is free to rotate; (3) demonstrate a method for determining the lines of force in a magnetic field; (4) identify the positions of the poles of a magnet given the lines of force in a magnetic field and the geographic orientation; (5) construct one or more inferences to explain data shown in lines of force around magnets; (6) describe how the data support an inference about magnetic lines of force. In order to identify the present standing of the participants, a pre-appraisal is administered prior to presenting this module. By immediately scoring the pre-appraisal, the instructor is able to identify which sections of this module need heavier emphasis. The module contains instructional activities, rationale, references, materials list, and duplicated materials. The population for which this instructional program has been found to be effective includes preservice and inservice elementary school teachers. (BR)