Overhead crane is used for lifting loads and transport to another location.
An overhead crane, commonly called a bridge crane, is a type of crane found in industrial environments. An overhead crane consists of parallel runways with a traveling bridge spanning the gap. A hoist, the lifting component of a crane, travels along the bridge. If the bridge is rigidly supported on two or more legs running on a fixed rail at ground level, the crane is called a gantry crane or a goliath crane.

Work study consists of two techniques namely method study and work measurement.
The method study is a technique to simplify the job and develop more economical methods of doing it. Work study is concerned with improving present method and finding standard time.

The Work measurement is concerned with the elimination of ineffective time and establishment of time standards for a job.
Work study is mainly aimed at determining the most efficient method of performing a job. Basic tool in work study is stop watch.