This school appeared at the end of the XIX century – the beginning of the XX century, In American experimental psychology. This school was co-founded by a number of American psychologists, Make believe: William James, John Dewey, Angel, and Woodworth, Herbert Spencer, According to this school, In the psyche it is possible to determine certain psychological functions, They are independent elements. The constructivist school focused on the synthesis of psychological functions, The functional school focuses on the roles or functions performed by psychological functions. This school was influenced by Darwin’s theory, It also has to do with the behavioral school, From it emerged the concept of adaptation or compatibility to the environment surrounding man, It has contributed to the development of psychological tests and scales, and cognitive psychology.