Philip Pettit

‘By political thcory," ]0hn Plamcnatz wrote, "I d0 not mean explanations of how governments function; I mean systematic thinking about the purposes of govcrnmcnt."l Political theory is a normative disciplinc, designed t0 let us evaluate rather than explain; in this it resembles moral or ethical theory. What distinguishes it among normative disciplines is that it is designed to facilitate in particular the evaluation of government or, if that is something more general, the statc.2 We are to identify the purposes of govcrnmcnt—morc strictly, the proper purposes of govcmmcnt—s0 that we can decide on the best political arrangements for society. I work with Plamcnatz’s definition in this book. The readings 0{Tcrcd here are all in one way or another relevant to the normative analysis of the state. I stress this point at the outset as readers interested in explanatory political thcory—thc sort of theory that ideally informs empirical research on the statc—may otherwise bc disappointed with what I provide. If such readers know at the beginning what they are getting, than they will have no reason later to complain. Indeed they may even bc pleasantly surprised, when they discover that normative political theory, as the essays in this volume represent it—pa.rticula.rly..

Taken as a model for how groups should make collective judgments and decisions, the ideal of deliberative democracy is inherently ambiguous. Consider the idealised case where it is agreed on all sides that a certain conclusion should be endorsed if and only if certain premises are admitted. Does deliberative democracy recommend that members of the group debate the premises and then individually vote, in the light of that debate, on whether or not to support the conclusion? Or does it recommend that members individually vote on the premises, and then let their commitment to the conclusion be settled by whether or not the group endorses the required premises? Is deliberative democracy to enforce the discipline of reason at the individual level, as in the first possibility, or at the collective level, as in the second?

It is a priori on many accounts of colour concepts that something is red if and only if it is such that it would look red to normal observers in normal circumstances: it is such that it would look red, as we can say, under normal conditions of observation. And as this sort of formula is widely applied to colour concepts, so similar schemas are commonly defended in relation to a variety of other concepts too. Not only are colour concepts connected in such a fashion with human responses, so by many accounts are secondary quality concepts in general; aesthetic concepts, moral concepts and evaluative concepts of all kinds; modal concepts that serve to pick out the possible and the necessary; and so on. The fashion for resorting to such formulas should not be surprising. Most of us suppose that whether a given, ostensively introduced term has a certain semantic value – whether, for example, it designates a certain property – ought to show up in people’s tending to use it of things, and only of things, that apparently have that property. The obvious way of expressing this expectation is to require that the use of the ostensive term covary with the presence of the property in conditions that are normal in some sense for detecting that property. Thus there is prima facie reason to hold, and hold as an a priori matter, that for any ostensively introduced term, ‘P’, something is P if and only if it is such that it would seem P – people would be disposed to use ‘P’ to ascribe the corresponding property to it – under normal conditions of observation. The schemas invoked under this motivation may vary in many different ways, of course. First, they may not connect the bare or simple reality of being P with a normalised human response, as Philosophical Studies 96: 21–44, 1999. © 1999 Kluwer Academic Publishers. Printed in the Netherlands. 22.