Leading British, American and European philosophers contribute to this collection of essays, first published in 1976, in political philosophy. They are essays which have to do in different ways with better societies than the ones we have, and with ways of getting them. They exemplify what can fairly be called real political philosophy. Its past makers have been Plato, Hobbes, Locke, Rousseau, Hegel, Mill and Marx, and it consists in advocacy of certain social ends and of certain means, rather than uncommitted inquiry or comment. The advocacy is of a kind, of course, which depends on analysis and argument. The book will be of interest not only to those who are primarily concerned with philosophy, but students of politics as well.