In 2010, my co-authors and I published this paper in the Journal of Business and Psychology: Shanock, L. R., Baran, B. E., Gentry, W. A., Pattison, S. C., & Heggestad, E. D. 2010. Polynomial regression and response surface analysis: A powerful approach for examining moderation and overcoming limitations of difference scores. Journal of Business and Psychology, 25: 543-554.
IMPORTANT NOTE: We recently submitted a correction regarding a few technical details presented in the original article. We also revised the helpful spreadsheet for conducting response surface analysis that the article mentions.