  The best way to gain an understanding of the issue is to imagine being the designer of a robot that has to carry out an everyday task, such as making a cup of tea. Moreover, for the frame problem to be neatly highlighted, we must confine our thought experiment to a certain class of robot designs, namely those using explicitly stored, sentence-like representations of the world, reflecting the methodological tenets of classical AI. The AI researchers who tackled the original frame problem in its narrow, technical guise were working under this constraint, since logic-based AI is a variety of classical AI. Philosophers sympathetic to the  computational theory of mind—who  suppose that mental states comprise sets of propositional attitudes and mental processes are forms of inference over the propositions in question—also tend to feel at home with this prescription.