Abstract
Williamson defends armchair philosophy by likening it to armchair science – they have the same echelon of results and use such a priori methods as model building and conditional analyses. More, if a priori methods are accepted within science, then they acceptable in philosophy – thus, armchair philosophy is justified. However, I am not swayed by this reasoning: there could be non-armchair philosophers who use these a priori methods. So, there are two options – revise the notion of armchair philosophy or add more details to the aforementioned reasoning.