Hi Chuck:
Course content that's based on student learning outcomes (SLO's) and course objectives begins the process. Medial choices and other instructional aids are planned. Then lessons and lab time allocated. Finally, curriculum written (not necessisarily in this order). With these components, timing class is a mixture of experience, trial and error, and class dynamics.
Stronger students assisting weaker students can be a help, and usually eveyone benefits.
Regards, Barry
