Abstract
In order to be successful in writing, students should think of how they convey their thinking to others, and correct errors by themselves. This report analyzes the effect of using two kinds of error feedback, highlighting and the comment feature in Microsoft Word, to improve students' longitudinal writing competency. This study yielded the following results. Highlighting is effective when used to indicate errors in the use of quotations. Also highlighting is useful for motivating students to correct mistakes of vocabulary, registers, grammar, and run-on sentences. Comments are effective for addressing errors of logic and clarity. In addition, comments are useful for addressing structural issues related to Japanese academic writing.
