Organotins are a group of compounds which have a variety of properties and uses. The focus of this Concise International Chemical Assessment Document (CICAD) is on those mono-and disubstituted organotins mainly used as stabilizers in PVC, as catalysts for the production of electrodeposited coatings, in silicone rubbers, and in powder and glass coatings. The CICAD evaluates the health and environmental effects of these organotins and presents a summary of the uncertainties inherent in the risk characterization of this group of compounds.