Unlike Affirmative Action, diversity has nothing to do with legislation or judicial process. Diversity is a social movement organized and promoted by businesspeople themselves, including many white males. Their message to everyone else in business is this: Human diversity in the workplace is good for business, and we should quickly move beyond the minimal requirements of Affirmative Action to include people of every variety (in terms of national origin, ethnicity, gender, age, physical ability, and so forth) throughout all levels and functions of our companies.

http://www.grovewell.com/pub-diversity-explain.html