WHILE THE LITERATURE ON LEGISLATORS’ ATTITUDES HAS BECOME impressive in the course of the last decade, the study of legislative behaviour lags markedly behind. Even S. C. Patterson's Legislative Behaviour remains primarily concerned with the examination of legislator's attitudes. One of the clearest examples of this trend is exemplified by roll-call analysis: studies of roll-calls have principally attempted to elucidate the ideology or specific attitudinal characteristics of members of legislatures; they have not been concerned with the outcomes of these roll-calls as such, inasmuch as they might have constituted an indication of the extent to which legislatures could and did affect the ‘rule-making’ process in a national community.