The aim of this document is to provide development practitioners with an introduction to the SLED process as well as guidance for practitioners facilitating that process. The Sustainable Livelihoods Enhancement and Diversification (SLED) approach has been developed by Integrated Marine Management Ltd (IMM) through building on the lessons of past livelihoods research projects as well as worldwide experience in livelihood improvement and participatory development practice. It aims to provide a set of guidelines for development and conservation practitioners whose task it is to assist people in enhancing and diversifying their livelihoods. Under the Coral Reefs and Livelihoods Initiative (CORALI), this approach has been field tested and further developed in very different circumstances and institutional settings, in six sites across South Asia and Indonesia. While this process of testing and refining SLED has been carried out specifically in the context of efforts to manage coastal and marine resources, it is an approach that can be applied widely wherever natural resources are facing degradation because of unsustainable human use. The SLED approach provides a framework within which diverse local contexts and the local complexities of livelihood change can be accommodated.