Book Info enlarge picture Understanding Human Behavior and the Social Environment (with InfoTrac)   Author: Charles Zastrow, Karen K. Kirst-Ashman ISBN: 0534608310 Format: Publish Date:                  Book Review This best-selling human behavior in the social environment text was the first to offer a balanced look at human lifespan development through the lens of social work theory and practice. The authors use a systems theory framework to cover human development and behavior theories within the context of family, organizational, and community systems. Using a chronological lifespan approach, the authors present separate chapters on biological, psychological, and social impacts at the different lifespan stages. The bio-psycho-social-theoretical content is organized within the authors' Systems Impact Model, which helps students to better understand individual behavior in the various settings.