time and motion study

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An analysis of the efficiency with which an industrial operation is performed. Also called motion study, time study.

Wiktionary

1. n. an analysis of the motions used in an industrial process with an aim to improve efficiency and productivity

WordNet 3.0

1. n. an analysis of a specific job in an effort to find the most efficient method in terms of time and effort