Check out the information on argument mapping at: http://www.austhink.com/
They sell software to make it easy to diagram a concept with words and grapic elements. They also explain what argument mapping is and how to use the technique to clearly present an idea, even if you don't buy their software.
This is a link to Austhink

Here is a site that has good foundation information on how to build a scaffold for a case-based learning environment
This is a link to Case Based Learning in your Classroom by Waterman and Stanley



University of Southern California has gotten serious about case based learning.
Checkitout