Abstract
Drake's equation implies that the number of galactic communities technologically more advanced than our own is proportional to the average longevity of a community. But if there are significantly different kinds of community such a simple equation may not be adequate for estimating numerical values. Extra terms are needed for each different kind. Spatial inhomogeneity of coexisting communities is also critical and is not reflected by a single universal average. Information flow resulting from contacts between accidentally close-spaced communities could be important in extending life to those communities. Spatial inhomogenity or other factors leading to temporal nonequilibrium could be dominant in determining the number of superior galactic communities exant today. The plus-or-minus on estimates of population by Drake's equation spans a number of cases where different courses of action on our part are implied. It is therefore unavoidable in practice to identify the various regimes case by case and to consider corresponding plans for action.
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