Human developmental periods
The period of human development – a concept derived from psychoanalysis, in which the leading role is given to the conscious actions of the individual under the influence of the environment. Development is understood as an evolutionary process in which an individual achieves an increasingly higher level of integration through psychosocial crises. It is accomplished by solving difficulties related to changes on the levels on which it takes place: biological, psychological and social. Development is therefore the mutual adaptation of the individual and the environment.