Very often instructional designers start thinking about how case studies are complicated to present to the learner.
Here is an example of how a simplified interaction interface can make a case study work very well:
It is good to notice how the complexity is hidden from the learner.
Cathy Moore's blog has an interesting analysis of how this was made (info from behind the scene), that makes an interesting read.
http://blog.cathy-moore.com/2010/05/elearning-example-branching-scenario/#more-979
