Appeals to need abound in everyday discussion. People make claims about their own needs all the time, and they do so in a way that suggests these should have a certain moral force. Needs also play an important role in contemporary popular discourse about social justice, climate change, obligations to future generations, dealing fairly with refugees, treating animals humanely, and critiques of consumerist lifestyles – to name just a few of the many examples. The idea of need is present in an increasing number of debates and domains. There is interest in need from several disciplines, not just philosophy, which also include psychology, economics, political science, social work and sociology. This volume, then, offers a fine introduction to an increasingly important concept in day-to-day life. In a new Foreword, Gillian Brock discusses the continuing significance of several innovative chapters in the book, indicating how they presaged new directions in philosophical conversation.