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absolute accuracy activities adjusted SCORE value Appendix assembly-serve systems average performance rating cafeteria carts cleaning clerical CM CM coffee breaks confidence interval confidence level correct rating delay and idle department effectiveness desired accuracy determine dietary personnel dietitians direct labor dish machine dishroom distribution of labor dumb waiter equipment evaluation films food preparation food service food trucks foods in stages forced delay full-time equivalent workers gred high PI hospitals higher hospital dietary departments indirect work functions labor hours meal equivalents meals daily minutes per meal nonprofessional hours normal number of observations number of readings patient trays percentage distribution percentage error percentage of food performance measurements performance sampling study personnel effectiveness personnel productivity PI group preparation when purchased productivity index rri rri SCHEDULED HOURS speed spent stage of food standard deviation tempo or pace total labor minutes total number transportation empty tray assembly line utilization of personnel various work functions wards