Which of the following developments did NOT occur in the field of human resource management during the 1950s and 1960s?
a. Selection tests from World War II were adapted for use in private industry.
b. Personnel management began to be recognized as being critically important to organizational success.
c. Government legislation expanded, adding more complexity to human resource management.
d. Reward and incentive systems became more sophisticated.
e. Labor unions became more powerful and demanded more benefits for their members.