EN
The aim of this paper is to collect and characterise Onufry Kopczyński’s prescriptive views, which are dispersed across his works, in particular grammar books. There are numerous studies regarding this grammarian; it is known that his scientific and teaching activity had a major influence on the shape of and attitudes towards Polish, yet no synthesis of his assumptions has been made. This paper presents the assumptions in a descriptive manner, and its summary is a synthetic itemised enumeration of the principles which, in the scholar’s opinion, should form the theory and practice of oral and written communication.