Szukana fraza: [Abstract = "A group of 15 synonyms was selected, including historical and presently applied terms, proposed by various researchers or used in popular language. These terms were first characterized, and then compared to knowledge workers in terms of similarities, differences and areas of overlap. Comparison pointed to a number of features strongly related to knowledge work. Based on them, a sketch definition was proposed\: Knowledge workers work mainly on symbols \(representations\), transforming them in cognitive processes, which is the main source of added value."]