Editing Principle of rationality (section)

==Newell==
{{See also|Artificial intelligence|Knowledge level modeling}}
In the context of [[knowledge-based systems]], Newell (in 1982) proposed the following principle of rationality: "If an agent has knowledge that one of its actions will lead to one of its goals, then the agent will select that action."<ref>[[Allen Newell]]. ''The knowledge level.'' Artificial Intelligence, 18:87-127, 1982.</ref> This principle is employed by agents at the [[knowledge level]] to move closer to a desired goal. An important philosophical difference between Newell and Popper is that Newell argued that the knowledge level is real in the sense that it exists in nature and is not made up. This allowed Newell to treat the rationality principle as a way of understanding nature and avoid the problems Popper ran into by treating knowledge as non physical and therefore non empirical.