Intended for educators who wish to work with small groups of students from larger classes, this catalog describes seven common instructional grouping arrangements, and four associated concerns, revealed by a 1979-1980 survey of teachers and programs in Nevada, Utah, and northern California. The instructional grouping arrangements include (1) cross-age and peer tutoring, (2) developmental programs, based on primary school children's physical development, (3) learning centers within classrooms, (4) pull-out programs for students to work outside the classroom, (5) staggered or split scheduling, (6) subject matter grouping, and (7) team teaching. For each grouping arrangement, the catalog gives a brief definition, discusses the grouping's goals, structure, coordination and support, advantages, and problems, and lists the survey respondents using it. The four concerns noted by the catalog are the use of aides, time for teacher coordination, communication with parents, and scheduling of teachers and students. The catalog offers successful strategies for handling each concern and mentions the programs that developed them. An index of all survey respondents, with addresses and telephone numbers, allows catalog users to contact programs directly for answers to questions. (RW)