Through its Green Carbon Initiative, WWF is deeply involved in the process of developing a credible and comprehensive standard system for forest carbon projects. This guidebook sets out what an appropriate meta-standard framework (MSF) must encompass in terms of both technical and methodological elements and implementation procedures to guide project developers and investors. It identifies those issues for which adequate guidance exists and point to where to find it. It also discusses topics for which further development is encouraged. Finally, It describes how WWF is already testing and helping to contribute to this emerging guidance through two field-based pilot forest carbon projects.