In a self - contained classroom, you can gain nearly a full instructional period a day by simply training students to manage two routines more responsibly. (educationworld.com)
Students in grades 4 and 5 attend two weekly instructional periods; one 30 minutes and the other 45 minutes. (niskayunaschools.org)
Teachers may then further divide the group during instructional periods using either the heterogeneous or homogeneous model. (thoughtco.com)