This document discusses Bronfenbrenner's ecological systems theory and how it influences the assessment of family and environmental factors that impact child development. It describes the microsystem, mesosystem, exosystem, and macrosystem layers of influence. Family history, housing, employment, income, social integration, and community resources are identified as key environmental factors to consider. The assessment framework is intended to help practitioners systematically evaluate a child's development and risks, while recognizing that low income, poor housing, and social exclusion can negatively impact development.