system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
"Best mutual adjustment of man and his work for improvement of human efficiency" is known as:
assistant
The correct answer is  Ergonomics means fitting the job to the worker. Training in ergonomics involves designing of machines, tools, equipment and manufacturing processes, lay out of places of work, methods of work and environment in order to achieve greater efficiency of both man and woman. Ref: Park 21st edition page 744.