Obstruction has often been regarded as an abhorrent feature of American legislatures, but few attempts have been made to specify the conditions under which it occurs or the precise nature and degree of its putative evil. This paper presents a theory of decentralized decisionmaking that specifies the necessary and sufficient conditions for sophisticated obstruction by committees. The assumptions of the theory are embedded in a simulation model which generates preferences and status quo points, identifies outcomes under competing behavioral assumptions, and estimates the representativeness of outcomes as a function of legislators' ideal points. The results call for rejection of the hypothesis that obstruction leads to unrepresentative outcomes.