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What all development models have in common is that option B is correct because development is a continuous process over the lifespan.
A development model serves as a guide against which customer behavior can be compared. For example, a model for assessing people's behavior is based on the eight stages of psychosocial development defined by 20th-century psychoanalyst Eric Erikson from birth to late adulthood. It represents his five development models: waterfall, iteration, V-shaped, spiral and extreme programming. These models also have advantages and disadvantages. These six developmental theories he discusses from an evolutionary perspective are Gestalt, Psychoanalysis, Behaviorism, Cognitive Psychology, Piaget, and Vygotzki.
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