Answer:
Lillian and Frank Gilbreth.
Step-by-step explanation:
Lillian and Frank Gilbreth are the husband and wife team that conducted time and motion studies, worked for General Electric to develop foot-pedal trash cans and redesign shelves in refrigerators, and had their lives documented in the book Cheaper By the Dozen.
They coined the word "Therblig" in order to identify the basic elements of human activity and motion in the study of time and motion which is typically aimed at improving the productivity and efficiency of workers while reducing fatigue simultaneously.