 The growing-reliability hypothesis is threatened not only if additional group members are less competent than existing members  (Section 3.2),  but also if existing members lose competence when the group grows too much. Firstly, the deliberation process, to which members partly owe their competence  (Section 4.5),  can become less fruitful: some bodies are too large for successful deliberation. Secondly, large “anonymous” bodies can demotivate members, who feel individually less responsible and spend less effort on forming correct judgments. The opposite effect is also imaginable: adding members can improve deliberation and motivation. Bodies can be too small, not just too big (see the debates over optimal parliament size, e.g., Elster 2012).