Abstract:- The Gilbreths pioneered manual motions and developed basic laws of motion economy that are still relevant today.They were also responsible for the development of detailed motion picture which are extremely useful for analyzing highly repetitive manual operations.Motion study is a technique of analyzing the body motions employed in doing a task in order to eliminate or reduce ineffective movements and facilitates effective movements for developing processes.By using motion study and the principles of motion economy the task is redesigned to be more effective and less time consuming.In a broad sense, motion study encompasses  job simplification so that it is less fatiguing and less time consuming. It is a graphic representation of an activity and shows the sequence of the therbligs or group of therbligs performed by body members of operator.It is drawn on a common time scale.In other words, it is a two-hand process chart drawn in terms of therbligs and with a time scale.On analysing the result of several motion studies conducted,Gilbreths concluded that any work can be done by using a recipe of some or all of seventeen fundamental motions, called therbligs .These can be classified as effective therbligs and ineffective therbligs. Effective therbligs take the process progress towards completion.