The document discusses the concept of co-creation, where companies systematically collaborate with consumers to develop or improve products. It provides definitions of co-creation, describes the motivations and roles of both companies and consumers in co-creation efforts. The document also summarizes interviews with co-creation practitioners, who discuss challenges of co-creation for companies, and the importance of both lead users and average consumers. Finally, it outlines an experiment that tested how different levels of a brand's co-creation efforts affected non-co-creating consumers' perceptions of the brand and product.