This document defines key concepts related to families and social class. It discusses what constitutes a family and different family types, including traditional, new, and non-traditional structures. The document also examines the family life cycle and roles within family decision making. Additionally, it explores the concepts of social class, including how social class is hierarchical and can be measured objectively or subjectively. Composite measures like socioeconomic status scores are presented. The document also discusses concepts like consumer socialization, geodemographic clustering, and profiles of different social classes including the affluent, middle class, and techno class.