Discursive Dilemma and Division of Deliberation:

A Proposal to Utilize the Cognitive Diversity Among Citizens

Abstract

Recent research on discursive dilemma and judgment aggregation fail to capture the diversity of perspectives and heuristics among participants. This paper proposes a modified version of “premise-based procedure (PBP)” and a “division of deliberative labor” in order to fill this blank.
  A premise-based procedure is recognized as a favorable aggregation procedure for deliberative democracy. Yet, PBP alone is insufficient to achieve the inclusion of the diversity of perspectives and heuristics among citizens.
  With the same logical conditions for “distributed PBP” (List and Pettit 2011), I propose a different aggregation procedure – the “perspective-wise PBP”–which allows the division of deliberation based on the diversity of perspectives among citizens. I also propose weighted additive heuristic as a collective aggregation mechanism for “perspective-wise PBT”. I argue that this amendment helps PBP achieve the robustness to cognitive diversity among citizens.
  A comparison among CBP, PBP, and “perspective-wise PBT” is presented. Logical conditions for “perspective-wise PBP” and its implications are discussed.