"Open structures lead to better long term retention."
"...e-learning environments with high navigational freedom have better long-term retention."
So all of my clients who require that lockstep navigation be in place -- who want to force the user to go through the content in a linear fashion in order to ensure that the user has processed the information (but not necessarily learned it) -- all these folks have it wrong? Phew!
On the implementation level, this gets tricky if the clients wants to track page hits to ensure completion. And what about Compliance courses? Tracking has gotta all come down to the assessment.
I've got to take a stand and start educating our clients as to the better approach.