This exploratory study examined relationships between support needs assessed with the French version of the Supports Intensity Scale (SIS; Thompson et al., 2004) and challenging behaviors as assessed with the Scales of Independent Behavior-Revised (Bruininks, Woodcock, Weatherman, & Hill, 1996). The Sample included 191 persons between 16 and 75 year old, with either a mild or moderate intellectual disability. Using correlation and inferential analysis, it was found overall that high frequency in challenging behaviors was related to a need for greater support intensity, particularly social support, and maintenance of emotional well-being. The findings highlighted the importance of establishing specific support measures that target social skills, receptive and expressive communication, and the management of stress and anger. (Contains 5 tables and 1 footnote.)