This document contains information about defining a market opportunity, including examples of famous failures and rejections before success. It discusses assessing the market size and characteristics, comparing the solution to competition, determining if the idea can be sold to customers and at a profit, and if the right team is in place to succeed. Examples given include Lucille Ball, The Beatles, Michael Jordan, Thomas Edison, Walt Disney, Abraham Lincoln, and J.K. Rowling. Charts show potential market size calculations and factors to consider like customer motivation and priorities for the team.