A“cognitive discourse analysis” was employed to analyze instructions for using a word processor written by eighth-grade students. The approach analyzes text structure in order to specify underlying semantic and conceptual knowledge structures. Our analyses revealed that the written instructions produced by the student writers were deficient in providing a reader with the information necessary for performing the task in two distinct ways. First, the group of students as a whole presented insufficient content information in their texts, particularly with respect to the subprocedures required to use the word processor. Second, the organization of students' texts did not parallel the hierarchical structure of the procedures described. These results suggest the importance of looking at writing from the point of view of the knowledge structures being expressed.