OCA—Observe, Communicate, Act—is the OHS key to success for supervisors. A training and coaching program that emphasizes participation to maximize the effect in the field. Know what to look for, when, where… Learn to step in, communicate, convince, and then act to eliminate lawsuits and preserve assets… OCA is not a recipe, it is an approach adapted to each context and challenge that includes, as needed, the development of customized monitoring tools..