Effectuation is a logic of entrepreneurial expertise. What makes great entrepreneurs isn’t genetic or personality traits, risk-seeking behavior, money, or unique vision. Effectuation research has found that there is a science to entrepreneurship and that great entrepreneurs across industries, geographies, and time use a common logic, or thinking process, to solve entrepreneurial problems. Effectuation is a logic of entrepreneurial expertise that both novice and experienced entrepreneurs can use in the highly unpredictable start-up phase of a venture to reduce failure costs for the entrepreneur.