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In page Differential psychology:

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Differential psychology studies the ways in which individuals differ in their behavior and the processes that underlie it. It is a discipline that develops classifications (taxonomies) of psychological individual differences. This is distinguished from other aspects of psychology [1][2] in that, although psychology is ostensibly a study of individuals, modern psychologists often study groups, or attempt to discover general psychological processes that apply to all individuals.[3] This particular area of psychology was first named and still retains the name of "differential psychology" by William Stern in his 1900 book "Über Psychologie der individuellen Differenzen" (On the Psychology of Individual Differences).[citation needed]