 To formally tackle limited knowledge about individuals, one could, for instance, introduce subjective probabilities over competence levels, i.e., over objective correctness probabilities. More simply, one can eliminate objective probabilities and competence altogether from the model and work solely with subjective probabilities over individual judgments (rather than over individual competence levels). If individuals are subjectively indistinguishable, judgments can be assumed to be interchangeable in de Finetti’s sense of permutation-invariance. This implies (with an additional assumption) that larger bodies are more reliable, without becoming asymptotically infallible, by a jury theorem for interchangeable voters (Dietrich &amp; Spiekermann 2013a; generalising Ladha 1993). Here, “reliable” and “infallible” are no longer objective features of the group, but features of knowledge about it.