This book has been five years in the making, off and on, and was inspired by our diverse experiences of producing field guides before that, which led to the idea of a manual based on actual experience, tested and documented through a logical process with the users. It has been a collaboration between two research projects, and we thank John Palmer, manager of the Forestry Research Programme, for bringing us together, and Katelijne van Rothschild, senior administrator, who has constantly supported and encouraged us.