REFA (Reich Committee for Working Time Determinationies) is a German organization designed to create a method to organize and develop the workplace and to determine production cycle times. It was founded in 1924 by the German Engineers Association.
The method focuses both on the determination and evaluation of time data as well as on the optimization of work processes following standardization. REFA generally consists in standardizing production operations and evaluating yield in the case of manual labor.
Generally, when we talk about rationing, we are referring to time, production or staffing norms.