Product Description:
Thompson, J.R., Bryant B., Campbell, E.M., Craig, E.M., Hughes, C., Rotholz, D., Schalock, R.L., Silverman, W., Tasse, M.J., & Wehmeyer, M.L. (2004). "Supports Intensity Scale: User's manual". Washington, DC: American Association on Mental Retardation.
http://www.aamr.org/Reading_Room/pdf/sis_overview.pdf