What are motion study principles? How are they classified? Name some reasons why methods analyses are needed. How is methods analysis linked to productivity improvements? How are devices such as flow process charts and worker-machine charts useful? What is a time standard? What factors must be taken into account when developing standards? What are the main uses of time study information? Could performance rating be avoided by studying a group of workers and averaging their times? Explain briefly. If an average worker could be identified, what advantage would there be in using that person for a time study? What are some reasons why an average worker might not be studied? What are the main limitations of time study