This document discusses lean testing approaches for validating business models. It encourages generating multiple business model scenarios and testing the best outcomes. Business model innovators are noted to change their models more frequently, adopt lean principles, and recombine existing ideas. The document provides templates for mapping out customer segments, value propositions, partnerships, revenues, and costs. It prompts identifying the biggest risks in a business model and forming test cards to evaluate hypotheses. The overall message is that business modeling is a low-risk way to determine the right for-profit or non-profit structure by testing assumptions.