Consumer behaviour research refers to the study of how and why consumers make purchasing decisions. It involves understanding consumers' motives, attitudes, and perceptions through techniques like questionnaires, in-depth interviews, and projective tests. The goals are to understand consumers' price sensitivity, preferences for full-line purchasing vs individual components, and differing needs across customer groups in order to effectively segment markets and differentiate marketing strategies. While consumers may be difficult to analyze due to multiple motives and attitudes that change over time, modern techniques can provide useful insights into purchasing behaviors.