The primary purpose of this Handbook is to serve as a practical guide to innovators of governance and socioeconomics in Large Marine Ecosystem (LME) projects. The Handbook explains why governance and socioeconomics are important to the success of resource management in the LME context. Good governance and socioeconomics can lead to good outcomes; bad governance and socioeconomics nearly always doom management efforts to failure. To improve the chances of successful management, the Handbook explains the basic principles and ingredients that make for good governance and socioeconomics – at all phases of LME project development, from the Transboundary Diagnostic Analysis to the Strategic Action Plan, and implementation of adaptive management and sustainable financing.