I think the responsibility for student retention falls on all administration of a school. Students should be screen before placement, all pre-requisits should be met and student concerns about time and projects need to be addressed. As a college student I can remember feeling very overwhelmed by the sheer mass of reading material and projects due on the same day. There were many nights that I went without sleep, not due to poor planning, but due to simply not enough hours in the day. I listen to my students when they express concerns about projects or material and if the concern is valid, I will adjust the timeline for the course to reflect their concerns. We might spend less time on a topic and more time on another, but we should be teaching what they don't know instead of covering the material they do know in order to be successful.