This is a draft. It's quite rambling in some places and probably contradicts itself in others.
Tone ranges from formal to conversational and switches person all over the place.
Don't take it too seriously. We're mainly concerned with the performance of the artifact, not with its aesthetics. Since students don't have many past experiences to draw from, a case library provides them with a similar sort of reference. It acts as a source of ideas and illustrates the effect of certain decisions. Learning from cases could also be described as learning by example.