The document discusses reference groups and their influence on consumer behavior. It defines normative and comparative reference groups and how they can influence individuals. It also lists some common consumer-related reference groups like friendship groups, work groups, and consumer action groups. The document then discusses the family life cycle and the eight roles family members can play in the family decision making process, such as influencers, gatekeepers, deciders, and others. It concludes with some examples of reference group appeals companies use, like using satisfied customer testimonials.