The Practice of Value is an exploration of a pervasive but puzzling aspect of our world: value. The starting-point is the Berkeley Tanner Lectures delivered in 2001 by the leading moral theorist Joseph Raz. His aim is to make sense of the dependence of value on social practice, without falling back on cultural relativism. The lectures are followed by discussions from three eminent philosophers, Christine Korsgaard, Robert Pippin, and Bernard Williams, and a response from Raz. The result is a fascinating debate, accessible to readers throughout and beyond philosophy, about the relations between human values and human life.