The purpose of the essay is to study documentation of teachers in reports of students’ development at school. The study will concentrate on what teachers write in the reports, to what degree the written text refers to the aims of the Swedish curriculum and also to study what kind of language the teachers use in the reports, based on theories of professional language. The material used consists of written reports from two classes, one in the 6^th and one in the 8^th grade from two different schools. The reports come from six teachers altogether, and the text has been divided in phrases which have been categorized in different groups depending on the content and the language used. The result of the study shows that the content of the reports, the size and the language used vary much from one teacher to another, and that they seldom refer to the aims of the curriculum. Another result is that teachers often address the pupil directly and use a everyday language, or mixed everyday and learned language in the reports.