This preface page of the volume Lessons Learned: Case Studies in Sustainable Use, provides a summary of the book's purpose and structure. Enhancing sustainability requires a multidisciplinary approach. Because there is such diversity in resources, uses, and users, there is no universal formula, yet to promote, or assess, practices in context is essential. Without this capacity approaches to sustainable use will remain superficial and ineffective.The present volume presents six detailed cases of uses of different facets of biological diversity in Africa (East, West and Southern), Central Asia and South America-Latin America;. The objective of the project was to identify 'Lessons Learned' from examples of sustainable use. To address this objective, six cases were selected because they had been implemented for several years and they were being implemented in different regions, thus enhancing the potential for identifying key lessons. Each of the case studies was examined using an 'Analytic Framework for Assessing the Factors that Influence Sustainability of Uses of Wild Living Natural Resources' The Analytic Framework (Annex 1) provided a consistent, systematic approach to the analysis of the cases according to 'domains of issues' considered important in assessing sustainability, including inter alia, ecological processes and functions, economic factors, societal and institutional factors.