The two world wars were important influences on the field of I/O psychology because they

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The two world wars provided an opportunity for the large-scale application of psychological testing to place individuals in jobs that suited their abilities, skills, and interests. The military needed a quick way to assess the abilities of millions of recruits, leading to the development of new forms of psychological testing and the formation of large-scale testing programs. This led to the development of the field of I/O psychology, which focused on the study of human behavior in the workplace.

The Two World Wars Were Important Influences on the Field