Frederick Taylor

Scientific Management:
Frederick W. Taylor
1856 – 1917
Frederick W Taylor was an American inventor and engineer, considered the father of “scientific management”. His influential theory enabled industry to move away from “rule of thumb” management and be more efficient and prosperous in order to raise productivity.
His principles are:
  * Develop a science for each element of a worker's job to replace rules of thumb.
  * Job specialization should be a part of each job.
  * Ensure the proper selection, training, and development of workers.
  * Planning and scheduling of the work are essential.
  * Standards with respect to methods and time for each task should be established.
  * Wage incentives should be an integral part of each job.
Henry L. Gantt
Henry Laurence Gantt worked as a management consultant as well as a background in mechanical engineer by trade.  He is known for creating his self-named easily-viewed scheduling and monitoring diagram. Harry L. Gannt made the contributions toward work scheduling and control. He tried to improve systems or organizations through task scheduling and reward innovation. Essentially, Gantt's most famous contribution was the Gannt chart, a system of control and scheduling we still use today.

Frank & Lillian Gilbreth 
Frank and Lillian Gilbreth were much concerned with the relationship between human beings and human effort, focused on the human aspects of work and understanding the needs and personalities of workers. They observed that workers developed their own peculiar ways of working and that no two used the same method. These observations led them to seek one best way to perform tasks.
Modern operational management theory:

Henry fayol
“The father of modern operational management theory " was a French mining engineer and director of mines who developed a general theory of business administration, also known as Fayolism.
Fayol's work was one of the first comprehensive statements of a... [continues]

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