Although psychology is a new study, its concepts have developed over time and a very relative example of this is Bronfenbrenner's bioecological systems theory, which explains the development in terms of relationships between individuals and their environments or interconnected over time. ""Mr. Bronfenbrenner identified this concept as chronosystems. In his works he transmits the classification of an individual and his related contextual variables, influencing development”” (Denise Boyd, 2009). By development, according to a psychological definition, development describes the growth of human beings throughout life, from conception to death. “The scientific study of human development seeks to understand and explain how and why people change throughout their lives. This includes all aspects of human growth, including physical, emotional, intellectual, social, perceptual and personality development” (Cherry, What Is Development?, 2011). The scientific study of development is important not only for psychology, but also for sociology. , education and healthcare. “Development involves not only the biological and physical aspects of growth, but also the cognitive and social aspects associated with development throughout life” (Cherry, What Is Development?, 2011). The study of human development is important in numerous topics, including biology, anthropology, sociology, education, history, and psychology. Most important, however, are the practical applications of the study of human development. By better understanding how and why people change and grow, we can then apply this knowledge to help people live to their fullest potential (Cherry, What Is Development?, 2011). DiscussionBronfenbrenner was a psychologist born in 19.... .. half of article ......entalpsychology/a/devissues.htmCherry, K. (2011). What is development? . Retrieved May 28, 2011, from About.com Guide: http://psychology.about.com/od/developmentecourse/f/dev_faq.htmDede Paquette, J.R. (2001, July 12). Bronfenbrenner's ecological systems theory. Retrieved May 28, 2011, from en.wikipedia.org/wiki/Ecological_Systems_Theory - Cached - Similar: http://pt3.nl.edu/paquetteryanwebquest.pdfDenise Boyd, P.J. (2009). Lifespan Development, 4th Canadian Edition. Upper Saddle River, New Jersey, USA: Pearsons Education Inc. Jane Haig, V. M. (2010). Citations and Sources APA Documentation Guide. Toronto: Nelson Education Ltd. Warren, J. (2010, April 10). Article database. Retrieved May 28, 2011, from Bronfenbrenner's ecological theory of development: http://www.articlesbase.com/history-articles/bronfenbrenners-ecological-theory-of-development-2128561.html