Answer:
Starting in the late 1800s, the classical perspective encouraged efficiency through standardization of work.
Put forward by Max Weber, the bureaucratic organization focuses on creating organizations with formal lines of authority and standard operating procedures to promote efficiency.
Arising from the Hawthorne studies in the early 1920s, the human relations movement  suggests that employees perform better when their managers treat them better.
The financial meltdown of 2008 was in part due to quantitative techniques of scientific management demonstrating the dangers of relying too heavily on the quants.