Proponents of deliberative democracy claim that it can provide a fair, effi
cient and creative method of collective decision making. In practice, howev
er, all groups, including those consulted within public spaces for delibera
tion such as consultative forums, are, in part, characterised by emotional
dynamics that threaten to undermine such deliberation. These dynamics can d
istort the process of deliberation, lead to sub-optimal outcomes and may ev
en destroy the spaces of deliberation themselves. More positively, these af
fective forces can be harnessed to further the alms of deliberative democra
cy. For these negative and positive reasons, it is necessary to understand
the emotional dynamics of groups and to apply this understanding to the des
ign of public spaces for deliberative democracy. By focusing on the case of
citizens' juries, this article shows how these aims can be furthered.