There are three foundation of the human development. Human development is made up from the biological, psychological, and social process. A human being must go through all these three processes in order to reach full maturity. It defines who we are and how we interact with and view the environment around us. Understanding human development and how it affects an individual is an essential theme in human services. Understanding the bio-psycho-social dimensions of human development, having cultural competency, and comprehending the general systems theory and how it works are all important parts of being an effective human service professional.