 The benefit to the worker is that it promotes incentive to learn how to do the work more efficiently.This system can also cost the worker if they do not perform a job within the allotted time such as in the case of an inexperienced worker or on a job where there is something preventing the service from being performed that the labor manual can't take into account.In automotive shops this is common due to rusted, seized, or stripped bolts or aftermarket installations.