During the 1971-72 pilot test of the Southwest Regional Laboratory's (SWRL) Instructional Management System (IMS), three alternative procedures were used to gather data within the classroom, transmit those data to SWRL for processing, and send IMS output to the appropriate recipients in the schools. ComSys 3--one of the three configurations--provided for the use of in-the-school optical scanners and line printers with direct connections to the main computing facility for IMS. Procedures for using the ComSys 3 configuration, together with evaluation criteria, are presented. (DGC)