This document provides an introduction to the sustainable livelihoods framework. It describes the framework as a tool to improve understanding of livelihoods, particularly those of poor people. The framework presents the main factors affecting livelihoods and their relationships. It can be used to plan development activities and assess how existing activities contribute to livelihood sustainability. The framework focuses on people and emphasizes the multiple interactions between factors influencing livelihoods. It does not present a linear model but aims to facilitate structured debate about livelihood issues.