The correct answer is option 1- 1920s to 1950s.
'NEO CLASSICAL THEORY — HUMAN RELATIONS APPROACH' was developed in 1920s to 1950s.
'NEO CLASSICAL THEORY — HUMAN RELATIONS APPROACH'- This school of thought developed between 1920s to 1950s felt that employees simply do not respond rationally to rules, chains of authority and economic incentives alone but are also guided by social needs, drives and attitudes. Hawthorne Studies at GEC etc., were conducted then. It was quite natural that in the early phases of the industrial revolution, the emphasis was on development of techniques and technology. The attention to the human factor was the salient aspect of this school of thought. This attention was to serve as a precursor to the development of behavioural sciences.
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