Abstract
Part I of this article comprising sections i–i, which appeared in the issue for June 1980 (Vol. XXVIII, No. 2), offered a critique of some standard power indices. Part 2 is devoted to working out an alternative way of thinking about power. Section iv defines success as luck plus decisiveness. Section v illustrates the use of these concepts by applying them to the example of the US Constitutional Convention. Section vi offers a definition of power in terms of the conditions under which an actor can be decisive. It is then suggested that power should increase in importance to an actor the more uncertain that actor is of the likely alignment of forces in the relevant period of time.

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