edited by Elisabetta Lalumera, Giovanni Tuzet

Today the role of experts is pervasive in the everyday life: governments and groups routinely delegate economic and technological decisions to experts, and the evaluation of academic and scientific institutions is demanded to expert peers. The aim of this issue is to collect a variety of points of view on the topics of experts and expertise, with a special focus on the following issues: (i) what experts are; (ii) how expert cognition differs from layperson cognition; (iii) to what extent it is rational to trust experts; (iv) how it is correct to characterize experts’ disagreement.