Frank And Lillian Gilbreth:
The following were the basic principles:
a) The management should understand the need and nessasity of workers.
b) Concept of 'speed work' were speed came from not by rushing the work but avoiding unessary work.
c) He identified 18 job motion known as 'THERBLIGS'
a. Search
b. Find
c. Select
d. Grasp
e. Position
f. Assemble
g. Use