The "industrial" side of I-O psychology has its historical origins in research on individual differences, assessment, and the prediction of performance. This branch of the field crystallized during World War I, in response to the need to rapidly assign new troops to duty stations. After the War the growing industrial base in the US added impetus to I-O psychology. [[Walter Dill Scott]], who was elected President of the American Psychological Association (APA) in 1919, was arguably the most prominent I-O psychologist of his time, although [[James McKeen Cattell]] (elected APA President in 1895) and [[Hugo Münsterberg]] (1898) were influential in the early development of the field.<ref>[http://www.siop.org/tip/backissues/tipjul97/farr.aspx Farr, J.L. Organized I/O Psychology: Past, Present, Future]</ref> Organizational psychology gained prominence after World War II, influenced by the [[Hawthorne studies]] and the work of researchers such as [[Kurt Lewin]] and [[Muzafer Sherif]].

The "industrial" side of I-O psychology has its historical origins in research on individual differences, assessment, and the prediction of performance. This branch of the field crystallized during World War I, in response to the need to rapidly assign new troops to duty stations. After the War the growing industrial base in the US added impetus to I-O psychology. [[Walter Dill Scott]], who was elected President of the American Psychological Association (APA) in 1919, was arguably the most prominent I-O psychologist of his time, although [[James McKeen Cattell]] (elected APA President in 1895) and [[Hugo Münsterberg]] (1898) were influential in the early development of the field.<ref>[http://www.siop.org/tip/backissues/tipjul97/farr.aspx Farr, J.L. Organized I/O Psychology: Past, Present, Future]</ref> Organizational psychology gained prominence after World War II, influenced by the [[Hawthorne studies]] and the work of researchers such as [[Kurt Lewin]] and [[Muzafer Sherif]].