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In psychology, developmental stage theories are theories that divide psychological development into distinct stages which are characterized by qualitative differences in behavior. [ 1 ] There are several different views about psychological and physical development and how they proceed throughout the life span.
Stage theories of development rest on the suspicion that development may be a discontinuous process including particular stages which are characterized by subjective contrasts in behavior. They moreover assume that the structure of the stages is not variable concurring to each person, in any case, the time of each arrangement may shift separately.
Erikson's stages of psychosocial development, as articulated in the second half of the 20th century by Erik Erikson in collaboration with Joan Erikson, [1] is a comprehensive psychoanalytic theory that identifies a series of eight stages that a healthy developing individual should pass through from infancy to late adulthood.
Life span development can be defined as age-relating experiences that occur from birth to the entirety of a human's life. The theory considers the lifelong accumulation of developmental additions and subtractions, with the relative proportion of gains to losses diminishing over an individual's lifetime. [14]
Baltes argues development across the lifespan is influenced by the “joint expression of features of growth (gain) and decline (loss).” [6] Extending on the premise of multidirectionality, this principle argues for the existence of a parallel process of development that is composed of both gains and losses.
So far, empirical research from a life course perspective has not resulted in the development of a formal theory. [8] Glen Elder theorized the life course as based on five key principles: life-span development, human agency, historical time and geographic place, timing of decisions, and linked lives. As a concept, a life course is defined as "a ...
Stage-crisis view is a theory of adult development that was established by Daniel Levinson. [1] [2] Although largely influenced by the work of Erik Erikson, [3] Levinson sought to create a broader theory that would encompass all aspects of adult development as opposed to just the psychosocial.
Loevinger's stages of ego development are proposed by developmental psychologist Jane Loevinger (1918–2008) and conceptualize a theory based on Erik Erikson's psychosocial model and the works of Harry Stack Sullivan (1892–1949) in which "the ego was theorized to mature and evolve through stages across the lifespan as a result of a dynamic interaction between the inner self and the outer ...