[1] It is related to what he called the 'logic of the situation' in an Economica article of 1944/1945, published later in his book The Poverty of Historicism.
Cognitive scientist Allen Newell elaborated on the principle in his account of knowledge level modeling.
Popper called his principle of rationality nearly empty (a technical term meaning without empirical content) and strictly speaking false, but nonetheless tremendously useful.
[4] These remarks earned him a lot of criticism because seemingly he had swerved from his famous Logic of Scientific Discovery.
"[5] This principle is employed by agents at the knowledge level to move closer to a desired goal.