 One way of spelling out this concern is in terms of what has come to be known as the expertise objection. The key contention here is that trained philosophers have a distinctive type of expertise. Thus, if we want to understand the process at the core of traditional philosophical practice, we need to study people who have this type of expertise. It is no good just looking at the judgments of people who have never taken a single philosophy course. A number of philosophers have developed objections along more or less these lines though with important differences (Williamson 2007; Ludwig 2007).