Incentives and instructions as controlling variables of productivity.
D000293:Adolescent; D000328:Adult; D004495:Education of Persons with Intellectual Disabilities; D006801:Humans; D008607:Intellectual Disability / Q000534:rehabilitation; D008297:Male; D009042:Motivation; D012054:Reinforcement, Psychology; D012201:Reward; D012759:Sheltered Workshops