 What is meant by an “expert”? For present purposes, let us focus on factual subject matters (rather than matters of taste, for example). By an expert, then, we shall mean someone who—in a specified domain—possesses a greater quantity of (accurate) information than most other people do. A layperson, by contrast, is someone who has very little information in the specified domain, and who doesn’t take him/herself to have such information. The problem facing the layperson is how to select, among the disagreeing putative experts, the one that is best (Goldman 2001).