Young & Rubican developed an audience segmentation method called the "4Cs" based on Maslow's Hierarchy of Needs. The 4Cs divides all people into 7 types based on their core needs or desires: Reformers who seek enlightenment, Explorers who seek discovery, Succeeders who seek control, Aspires who seek status, Mainstreamers who seek security, Strugglers who seek escape, and Resigned who seek survival. Case studies on Tide and WaterAid ads show how they appeal to different audience types - the Tide ad appeals to Mainstreamers and Aspires, focusing on family and domestic roles, while the WaterAid ad appeals to Reformers by challenging norms and to Mainstreamers