You've created some really great software, but is it sufficient to form the basis of a viable business? What's your business model? How can you describe your business model and effectively communicate your vision to others? How can other people evaluate your business model and determine whether your vision and business strategies have merit? This talk provides a conceptual basis for defining, documenting and evaluating business models. It uses real-world examples to show how these concepts can be effectively applied to build actual businesses. Presented at RubyNation 2011.