Applied psychology is the use of psychological methods and findings of scientific psychology to solve practical problems of human and animal behavior and experience. Mental health, organizational psychology, business management, education, health, product design, ergonomics, and law are just a few of the areas that have been influenced by the application of psychological principles and findings. Some of the areas of applied psychology include clinical psychology, counseling psychology, evolutionary psychology, industrial and organizational psychology, legal psychology, neuropsychology, occupational health psychology, human factors, forensic psychology, engineering psychology, school psychology, sports psychology, traffic psychology, community psychology, medical psychology. In addition, a number of specialized areas in the general field of psychology have applied branches (e.g., applied social psychology, applied cognitive psychology). However, the lines between sub-branch specializations and major applied psychology categories are often blurred. For example, a human factors psychologist might use a cognitive psychology theory. This could be described as human factor psychology or as applied cognitive psychology.
The founder of applied psychology was Hugo Münsterberg. He came to America (Harvard) from Germany (Berlin, Laboratory of Stern), invited by William James, and, like many aspiring psychologists during the late 19th century, originally studied philosophy. Münsterberg had many interests in the field of psychology such as purposive psychology, social psychology and forensic psychology. In 1907 he wrote several magazine articles concerning legal aspects of testimony, confessions and courtroom procedures, which eventually developed into his book, On the Witness Stand. The following year the Division of Applied Psychology was adjoined to the Harvard Psychological Laboratory. Within 9 years he had contributed eight books in English, applying psychology to education, industrial efficiency, business and teaching. Eventually Hugo Münsterberg and his contributions would define him as the creator of applied psychology. In 1920, the International Association of Applied Psychology (IAAP) was founded, as the first international scholarly society within the field of psychology.
Most professional psychologists in the U.S. worked in an academic setting until World War II. But during the war, the armed forces and the Office of Strategic Services hired psychologists in droves to work on issues such as troop morale and propaganda design. After the war, psychologists found an expanding range of jobs outside of the academy. Since 1970, the number of college graduates with degrees in psychology has more than doubled, from 33,679 to 76,671 in 2002. The annual numbers of masters’ and PhD degrees have also increased dramatically over the same period. All the while, degrees in the related fields of economics, sociology, and political science have remained constant.
Professional organizations have organized special events and meetings to promote the idea of applied psychology. In 1990, the American Psychological Society held a Behavioral Science Summit and formed the “Human Capital Initiative”, spanning schools, workplace productivity, drugs, violence, and community health. The American Psychological Association declared 2000–2010 the Decade of Behavior, with a similarly broad scope. Psychological methods are considered applicable to all aspects of human life and society.
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