This book explains how tests for intelligence, personality, and skills were born, how they grew, and how they work today. In 1905, Alfred Binet and Théodore Simon created the first practical IQ test in France to help children who struggled at school. During World War I, the U.S. Army used group tests called Army Alpha and Beta to sort recruits. Those events show how tests moved from small studies into large social uses. Over time, ideas from figures such as Freud and Jung shaped early personality tools. Later methods added scientific checks, but many people still do not know what tests really measure or how reliable they are.
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