Reply #48: Exactly--we're not reaching people and need to consider why.

[QC]

This is something every conscientious teacher deals with.

You will always have some students who simply do not care, and some others who just aren't very bright, but if I give a test and most of the class fails it, I have to consider the possibility that there was something wrong with either my presentation of the material or with the design of the test itself, for which I am also responsible.

I think there's a parallel to this discussion. If nobody gets it, then chances are that "it" wasn't presented very well.