e-Learning Terminology

I'm currently working with some groups of learners, all new to e-Learning in the organisational context - one of the challenges is getting their heads around all the terminology - so - we look for quality glossaries of terms online as reference points.
I found this one the other day - and thought I'd just have to share this gem of a definition:

Construct Irrelevance:
"The extent to which test scores are influenced by factors that are irrelevant to the construct that the test is intended to measure. Such extraneous factors distort the meaning of test scores from what is implied in the proposed interpretation."

Right...now that makes wonderful sense in plain English to people new to e-Learning (and in this case online assessment) - do you think they mean: Don't ask irrelevant questions in assessment quizzes?
:-)