During the first half of the 20th century, what activity came to characterize applied psychology more than any other?

Question

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Intelligence testing became a prominent area of focus in applied psychology during the first half of the 20th century, particularly due to its use in World War I for selecting and placing soldiers in appropriate roles based on their mental abilities. This led to the development of standardized IQ tests and the widespread use of intelligence testing in education, business, and other fields.

During the First Half of the 20th Century, What Activity