Human Behavior and the Social Environment Social work has long recognized the relationship between an individual's behavior and the environment in which the individual interacts (Hutchison, 2008). Theories of human behavior offer a framework for organizing, interpreting, and understanding this relationship (Hutchison, 2008). For this case study, the relevance of the following three theories will be examined: life cycle theory, role theory and resilience theory. Life Cycle Theory Psychosocial development through life cycle theory (sometimes known as individual development theory) proposes that each individual has the ability to master their environment at all stages of life (Coady & Lehman, 2008; Hutchison, 2008). The theory began in Freud's psychosexual stages of childhood development; however Erikson is responsible for laying the foundation for the theory as it is known today, proposing an epigenetic model of human development (Hutchison, 2008). The main point of the theory of psychosocial development throughout the life cycle is that an individual's personality is kept developing throughout life, with healthy development based on the individual's ability to master tasks and skills at each level or stage of life. life (Coady & Lehman, 2008; Hutchison, 2008). Erikson's original model divided the lifespan into eight levels, each containing its own unique psychosocial challenge or conflict that, depending on the outcome, would help the individual experience positive growth (Coady & Lehman, 2008; (Hooyman & Kiyak , 2005/2011; Hutchison, 2008).The eighth stage includes late adulthood, where the conflict experienced is that between integrity and desperation whether an individual has experienced success or... halfway... amilies in Society, 86(3), 367-373 doi:10.1606/1044-3894.3434 Hooyman, N., & Kiyak, H. A. (2011 Social gerontology: A multidisciplinary perspective (9th ed.). Boston: Allyn & Bacon (original work published 2005) Hutchison, E. (2008). Behavior, M., & Lohman, C. (2009). . Journal of Gerontological Social Work, 52(7), 713-728. doi:10.1080/01634370802716216Resnick, B., Gwyther, L., & Roberto, K. (eds.). (2011). Resilience in aging: Concepts, research, and outcomes (1st ed.). New York: Springer Science & Business Media, LLC.Richardson, G. E. (2002). The metatheory of resilience and resiliency. Journal of Clinical Psychology, 58(3), 307-321. doi:10.1002/jclp.10020