The document discusses various theories and models related to understanding consumer behavior, including motivations, personality traits, lifestyles, self-concept, attitudes, and how attitudes can be changed. It covers topics like the consumer value framework, the trait approach to personality, methods of measuring lifestyles like VALS and PRIZM, the different components of self-concept, attitude models like the attitude-toward-the-object model and the behavior intention model, and theories on how to change attitudes through changing beliefs, behaviors, and feelings.