This document discusses the importance of purpose for organizations. It states that purpose inspires focus, attracts people, and allows organizations to persevere through challenges. The document advises organizations to anchor their purpose in solving real problems in order to set an appropriate scale and influence the design of solutions. It suggests that purpose and problems together form the basis of an organization's business model. The document introduces business models and recommends using a Social Lean Canvas template to map out an organization's model. It provides resources for getting started with social enterprises, including contacting local foundations, joining meetup groups, and participating in startup weekends.