ABSTRACT
The concept of practicality is one of the central concepts of praxiology or at least of the praxiology initiated by a Polish philosopher Tadeusz Kotarbinski. Issues of practicality, though at the time not understood in the clear-cut way that they subsequently were, interested Kotarbinski from the beginning of his philosophizing. One model that theoreticality gives to practicality is undoubtedly the way in which theoreticality deals with its own defectiveness. This consists in resorting to the category of theoretical or cognitive error. The internal limitation of practicality is caused, as paradoxical as this may sound, by practicality itself. This limitation is caused by the inverse proportionality of the components of practicality. Increased effectiveness is usually accompanied by increased use of resources, and thus decreased efficiency. The external boundary of practicality is different for different actions, as pointed out by Kotarbinski when he was considering ethical scruples related to fighting.
