Mistakes in the written texts: orthologic and communicative activity approach

In this article the typical mistakes are analyzed from viewpoint of orthological and communicative activity approaches. Consideration of the factors, which causing a change in perceptions of linguistic norms in the minds of native speakers. Causes of lexical-semantic, grammatical, spelling and punctuation mistakes characterized in terms of intellective and speech writer’s activities, which are established in his mind mechanisms of information perception, concepts of modern communication standards.