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First introduced in World War I, Psychologists implemented screening processes which they hoped would delineate which soldiers exhibited appropriate mental fitness to cope with the stress of war. The military wanted to avoid the incidence of shellshock, which had affected so many soldiers during WWI. They believed, through psychological testing, they could screen out the men that were most susceptible to breaking down. Although these measures were found to be largely unsuccessful in preventing mental health issues, the psychometric testing that was developed set the stage for the growth in psychological assessment that occurred after the war.
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During World War I, psychologists began implementing screening processes to identify soldiers who were mentally fit to handle the stress of combat. The military wanted to prevent incidents of shellshock, which had plagued many soldiers in the previous war. Despite the limited success of these measures in preventing mental health issues, the development of psychometric testing during this time laid the foundation for the later growth of psychological assessment techniques.