Chapter 1: introduction to human behavior and the social environment. Human behavior: involves people"s actions, conduct, and responses. Environment: the surroundings or conditions in which people or other organisms live and function. Social environment: involves the systems of other people, including economic, political, legal, social, spiritual, and cultural, with whom any individual interacts as he or she operates within the encompassing environment. Social work is the profession that is recognized as having the primary responsibility to implement society"s mandate to provide safe, constructive, and effective social services. The process of social work: the importance of assessment. Information needs to be gathered, analyzed, and interpreted. Involves basic knowledge and assumptions about human behavior. There are always reasons why people behave the way they do. One primary task is to help the client define the alternatives available. There are four main phases: infancy and childhood, adolescence, young and middle adulthood, later adulthood.