This article describes a cognitive argumentation schema for written arguments and presents three empirical studies on the “myside” bias—the tendency to ignore or exclude evidence against one's position. Study 1 examined the consequences of conceding, rebutting, and denying other-side information. Rebuttal led to higher ratings of agreement and quality and better impressions of the author than when the same arguments excluded other-side information (i.e., exhibited the myside bias). In Study 2, claims had a significantly greater impact on agreement ratings and reasons had a significantly greater impact on quality ratings. When participants were given myside reasons supporting other-side claims, they acknowledged argument strength while making relatively minor changes in agreement. In Study 3, the authors found that a brief, theoretically motivated written tutorial was effective in improving undergraduate students' written argumentative essays by significantly increasing the precision of claims, improving the elaboration of reasons, and reducing the myside bias.

Students are expected to come into the current college classroom already possessing certain skills including the ability to write at the appropriate academic level regardless of discipline and the ability to create well-structured arguments. Research indicates, however, that most students entering college are underprepared in both areas. One strategy that may help students write at a more academic level is teaching students to focus on spending their time on revision. In the current study, we examine two potential sources of difficulty in the revision of argumentative essays: a poorly developed argument schema and a poorly developed global revision task schema. We created and tested the effectiveness of two written tutorials designed to provide college students information to saturate their knowledge base as well as provide them with procedural tasks to complete. We found that without instruction, students focused their revisions on making local wording changes that did not qualitatively improve their essays. An argument tutorial helped students make higher level global changes, include more argument content, and improve the structure of the essay. A global revision tutorial also helped students make more substantive structural changes. Thus, both tutorials helped students improve their revisions, and the tutorials were completed independently by the students successfully.