The 2013 NVCA Yearbook includes a comprehensive analysis of U.S. venture capital industry statistics. The main source of data for this publication is ThomsonONE.com, the online research database of Thomson Reuters. ThomsonONE.com is endorsed by the NVCA as the official United States venture capital activity database. The publication includes metrics regarding commitments made to venture capital funds, venture capital investments into entrepreneurial companies, and venture-backed exits (mergers and acquisitions and IPOs). The publication also includes appendices regarding portfolio company valuation guidelines, international accounting convergence and venture capital activity outside the United States.