The 'Discussion' section of this issue contains the following responses to Wilfred Beckerman's article 'Sustainable Development: Is it a Useful Concept?' Environmental Values 3,3 (1994): 191-209. Herman Daly, 'On Wilfred Beckerman's Critique of Sustainable Development'; Michael Jacobs, 'Sustainable Development, Capital Substitution and Humility: A Response to Beckerman'; and Henryk Skolimowski, 'In Defence of Sustainable Development' . These criticisms are answered by Beckerman in Environmental Values 4,2.