 Finite optimal group rather than wise crowds? The question of whether decision bodies should be augmented when new members are less competent is not far-fetched, but a notorious issue in real-life committee design. This is the trade-off: adding less competent members, on the one hand, lowers average member competence, but, on the other hand, brings the advantage of size, namely that errors of individual members are more easily overruled (“washed out”) by the majority. Depending on which effect is stronger, the probability of majority correctness increases or falls by adding less competent members.