This issue highlights a number of ongoing initiatives on the application and use of knowledge and communication, including our own efforts to serve as an open house for knowledge initiatives on sustainable mountain development. It brings to you a collection of reflections, learning, and insights of project managers, scientists, climate experts, knowledge and information managers, and development practitioners which we hope will contribute to a better understanding of the issues and gaps in our knowledge of global and regional problems such as climate change, as well as to a better understanding of the solutions to them. We understand the knowledge needs of policy and decision makers who have to deal with uncertainties; and so, in this volume, we have tried to compile and share some of the knowledge, best practices, and data available on mountain development issues.