In animation, a model sheet, also known as a character board, character sheet, character study or simply a study, is a document used to help standardize the appearance, poses, and gestures of an animated character. Model sheets are required when large numbers of artists are involved in the production of an animated film to help maintain continuity in characters from scene to scene, as one animator may only do one shot out of the several hundred that are required to complete an animated feature film. When drawn without such background, the character is referred to as off-model.