the structuring of the underlying categories of being themselves. Kant is mentioned by Zimmerman in this respect, and also Christine Korsgaard who, drawing on Kant's distinction between things-in-themselves and the relation between things, draws a similar distinction between intrinsic values (values in virtue of "non-relational properties") and extrinsic values (values in virtue of "relational properties"). Regarding the former an impasse is reached when all that can be said of intrinsic values is, in Moore's words, that goodness "just is", or in Zimmerman's words that pleasure "just is". This has led to some, like Monroe Beardsley, to say that only extrinsic values, in the final analysis, exist. Different kinds of extrinsic value in this model derive from the different underlying categories of relation, the example given being those of beauty, utility and meaning, each of which is supervenient on one of Kant's three categories of relation, namely disjunction, causality and inherence respectively. Deontology, on the other hand, (from the Greek Deon meaning "duty") is the branch of ethics that bases value on moral principles which in turn form a guide to knowing what "ought" to be done in various situations. The problem in philosophy of moving from an "is" to an "ought" (the "Is-ought problem") is said to have been introduced into philosophy by David Hume. Richmond Campbell, in discussing this, asks how one might move from a knowledge of what exists, i.e. from a whole range of possible values, to a knowledge of which, among these, one ought to value. Given that "a small number of core moral values are espoused universally" the answer would appear to lie in giving priority to those which do not "conflict". Frankena suggested that these moral principles are derived from three main sources: the prevailing moral rules of a culture; divine revelation as found in the holy texts; and logical or metaphysical deduction. Kant's categorical imperative is given as an example of the latter, although Frankena pointed out that a distinction would need to be made between arguments of logical necessity, i.e. those which contain no contradictions, and arguments of logical sufficiency which would be needed to account for the various kinds of value, whether "aesthetic, prudential or logical". Teleology and consequentialism Mark Schroeder in his article on Value Theory considers consequentialism to be "under the umbrella" of teleology, where the latter can be defined as that branch of metaphysics which deals with the