A concept which is described as the outcome resulting from specific decisions and choices made along the life course in areas of relationships, occupation, and childbearing is known as life structure. The life structure was proposed by Levinson and it has four seasonal cycles: pre-adulthood, early adulthood, middle adulthood and late adulthood. He said that the individual's life structure is largely affected by his or her physical environment. It may also involve economic status, family, race, religion, work and other important variables that could affect the individual.