'an excellent book: clearly written and packed full of interesting ideas and arguments.' -- J.R.G. Williams, Mind 'Both a sharply written introduction to the philosophical logic of vagueness and a persuasive defence of Smith's favoured theory.' -- David Ripley, Analysis 'one of the most important contributions on vagueness in the last ten years, and for years to come ... profound and original ... succeeds in promoting a new and inspiring conception of vagueness.' -- Paul Egre, Australasian Journal of Philosophy 'a very significant and important contribution to the debate.' -- Dominic Hyde, Bulletin of Symbolic Logic 'The book is clear, focussed, technically deft, and has impressive vision ... a must-read.' -- Graham Priest, History and Philosophy of Logic 'brimming with philosophical insight and formal niceties. It deserves to, and surely will, generate much discussion.' -- John Collins, Philosophical Quarterly 'required reading for anyone working on the logic and semantics of vagueness.' -- Roy Cook, Theoria 'There can be no doubt that it is a 'must read' for anyone engaged or just seriously interested in the debate on reasoning in face of vagueness. Moreover, I am convinced that the book is accessible and useful also to newcomers to the topic.' -- Christian G. Fermuller, Australasian Journal of Logic