WordNet (r) 3.0 (2006):

time study
    n 1: an analysis of a specific job in an effort to find the most
         efficient method in terms of time and effort [syn: time
         and motion study, time-and-motion study, time-motion
         study, motion study, time study, work study]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "time study":
   annals, check sheet, chronicle, chronology, clock card, date slip,
   datebook, daybook, diary, efficiency engineering,
   efficiency expert, industrial engineering, journal, log,
   management consultant, management consulting,
   management engineering, management theory, record, register,
   registry, scientific management, time book, time chart, time scale,
   time schedule, time sheet, time-motion study, timecard,
   timetable