These slides were used to facilitate a discussion of entrepreneurial MIT alums, mainly from the MIT Sloan business school. My intention was to introduce many of the newer, leaner concepts of early stage start-up development to a group that often sees "technology first" businesses. This presentation centers on the concept of Product / Market Fit: what it is, why it's important, and how to achieve it. I propose my "Product Market Fit Matrix" that helps to characterize the issues of the start-up and presents various frameworks that can help guide development. In a sense the Product / Market Fit Matrix is a meta-framework. For more information please visit: http://www.rishidean.com