The paper focuses on the “spillover thesis” which constitutes a pillar of much of contemporary participatory democratic theory; specifically, we assess the claim that workplace democratization leads to a higher degree of political participation amongst labourers. The paper analyses the thesis as formulated by Carole Pateman, including its later revisions triggered by ambiguous results of empirical studies aiming to (dis)prove it. The spillover thesis is then confronted with important methodological and theoretical critiques, the upshot being that in order to be (...) able to arrive at determinate conclusions, more carefully designed empirical studies are needed. Normatively speaking, however, blame can always be laid on the wider environment of market economy and/or representative democracy, to the effect that the spillover thesis is both difficult to disprove and radically subversive. Given the recent dominance of deliberative democratic theory which incorporates a strong participatory element, we finally discuss whether a recent innovation – namely, the concept of deliberative systems – could be fruitfully employed as a flexible umbrella-type framework for the spillover thesis and the participatory ideals related to it. (shrink)