This study investigated the effect of teacher feedback on Japanese as Second Language (JSL) learners' revision of their own compositions. Eleven participants wrote a letter to an imaginary pen pal. A few days later, they revised their original composition using the given feedback. Half of the students were given form-focused feedback and the other half, content-focused feedback. The original and the revised compositions were analyzed and compared for fluency, accuracy, complexity, and topical structure. Two types of measures were used : linguistic feature analysis and teacher evaluation. It...