For information about the appropriate vocabulary level of labels, be sure to
check out Chapter 8 on "Selecting the Right Reading Level" in my soon to be
released new book called Exhibit Labels: An Interpretive Approach.  Also see
Chapt. 6 on "Levels of Information," and Chapter 5 on "Learning Styles" for
discussions about writing for diverse audiences.
There are many other books and articles available on the topic of exhibition
labels, dating back to the 1930s available from most university libraries,
and through Visitor Studies Association, and the Committee on Audience
Research and Evaluation of the AAM.

--BSerrell