In most Yeshivas with which I am familiar, morning seder, the regimen of learning before lunch, is the more in-depth and intense learning seder, while afternoon seder (session) is generally less in-depth and often is designed to cover more ground.
When and how did this develop? Is there a reason that this should be the preferred method?
Note: I am not interested in the plethora of literature which is bashing this system. I am interested in the current system as it exists.
Other note: This is my personal observation of most Yeshivas. If you want to provide documentation that this is not the norm, that is fine, but please don't answer by arguing because you "feel" differently.