I can take absolutely no credit for this. I have a printed copy taped up near my desk, and I think clearly shows the number one conflict between SMEs and IDs. SMEs want to pass on all knowledge immediately because it is all important and necessary. IDs want to organize that into comfortable chunks for the learners.
To give credit, this is from one of my favorite blogs, Usable Learning.
Sorry about the quality, I scanned in my copy!