Briefly describe Bronfenbrenner's ecological systems theory as it applies to social work.

• A. Nested systems: microsystem, mesosystem, exosystem, macrosystem, chronosystem
• B. A linear model of development
• C. A focus on biology only
• D. A theory about organizational management

Answer: (B)

The main idea is that human development happens within multiple, interacting environmental layers that surround the individual and shift over time. Bronfenbrenner’s theory sees a person as embedded in concentric systems: the immediate setting you directly experience—family, friends, school, and neighborhood (microsystem); how those immediate settings influence each other (mesosystem); external environments that affect you indirectly through their impact on someone you interact with (exosystem); the broader cultural, economic, and political values and norms of the society (macrosystem); and the dimension of time—how life events and historical changes alter environments and development (chronosystem).

In social work, this means understanding a client within all these layers, not just one factor. Interventions can target different levels—from supporting family relationships and school connections to addressing community resources or policy barriers, all while considering how changes in one layer ripple through others and how events over time shape needs and outcomes.

The other descriptions don’t fit because they miss this multi-level, interactive, and temporal focus. A linear model of development implies a single, straight path; focusing only on biology ignores the environment; and a theory about organizational management is outside the scope of this developmental framework.