A step-by-step description is given of a method of applying a plaster of Paris walking cast that can be performed by one technician with minimal assistance. Plaster of Paris walking casts are recommended for the treatment of foot ulcers in leprosy. They are also an essential part of the treatment of tarsal-bone disintegration in leprosy. To be effective, a cast must be strong, light, and well fitted so that it does not rub and cauSe an abrasion which, because of anaesthesia, may remain unnoticed until a deep ulcer has developed. Since a plaster applied to an oedematous leg or foot becomes loose as the swelling subsides, steps should be taken to reduce swelling before the walking plaster is applied.