Entrepreneurs constantly seek capital for new and existing ventures even though they face considerable constraints in obtaining financing. Venture capital from outside investors has been considered an important driver in the start-up and growth of entrepreneurial firms. Unlike venture capital investments, angel investments are made by individual investors who do not make up a known population. Therefore, much of what is reported about angel investing comes from anecdotes and surveys of convenience samples, which are prone to biases and inaccuracies. This book examines the roles of angel investing in the entrepreneurial finance system and the funded and unfunded business plans to determine the key factors in the venture capital investment decision process.