The report is also a timely addition to the calls made by the Commission on Global Poverty, the Organisation for Economic Co-Operation and Development and others for incorporating quality of life dimensions into the way we understand and determine human deprivation. But all the best data in the world won't do us much good if they sit on a shelf collecting dust. They must be used to influence decisionmaking and accountability, and ultimately to transform the lives of the world's most vulnerable people. The last 15 years have shown us that progress on poverty is possible. But we also know that it is not inevitable— nor has it been universal. My hope is that this report will catalyse the global community to ensure that, this time, no one is left behind.