This white paper will demystify the concepts of open source for readers&#151especially those in Finance&#151who are unfamiliar with the movement’s principles. The paper will then explore the ways in which open source concepts can be applied to the area of business performance management (BPM)&#151the set of processes, including budgeting, forecasting, and reporting, that financial and operational managers use to make decisions and run their businesses. Finance readers will learn how they can harness open source to provide a new alternative to solve longstanding BPM problems, while IT readers will learn how to apply their open source knowledge to support their Finance organizations.