This study investigated the impact of ESL writing instruction on monnative-speaking college students through observation of an ESL writing class at a state university in the U.S. The data included the course syllabus, the students' essay portfolios, interviews with three volunteer students, survey questionnaires for both classes containing 8 and 12 freshmen, and interviews with the teacher. Detailed results and conclusions are presented. From the findings of this study, these suggestions for EFL teachers in Taiwan are discussed: (a) the importance of teachers' comments on students' writing for revising their drafts; (b) the need to include peer reviews in EFL writing instruction, underscoring their value in providing feedback on students' essays; (c) the value of self-assessment in developing students' ideas, and (d) the importance for students of face-to-face writing conferences with the teacher.