A lack of toileting skills is one of many impairments that individuals with intellectual and developmental disabilities experience. Unfortunately, little research has focused on problems in this area including assessment, function, and treatment. A newly developed checklist, the "Profile of Toileting Issues" ("POTI"), is being considered for use to screen for toileting issues in this population, and to identify potential functions to target in treatment. The purpose of the current study was to examine the reliability of the "POTI". Internal consistency was sound ([alpha] = 0.83) and interrater reliability was significant. The implications of these findings are included. (Contains 1 table.)