This study aimed to compare the effects of Automated Writing Evaluation Feedback (AWEF) and Peer Feedback (PF) on the development of self-regulation in writing among Iranian English as a Foreign Language (EFL) learners. The participants consisted of 58 intermediate-level Persian-speaking English learners, aged 25 to 30, enrolled in two intact IELTS preparation classes at a private language institute in Tehran. The learners were assigned into two experimental groups: one group (n = 30) received peer feedback, while the other (n = 28) received automated feedback through ProWritingAid. To assess the impact of these interventions, data were collected using the Writing Strategies for Self-Regulated Learning Questionnaire (WSSRLQ), semi-structured interviews, and classroom observations. Quantitative analysis using independent samples t-tests revealed significant improvements in self-regulation scores for both groups post-intervention, with the AWEF group showing a significantly greater increase. Qualitative analysis of interview and observation data further supported these findings, indicating that AWEF participants engaged in more structured and proactive revision practices, while PF participants developed greater reflective awareness and emotional resilience through collaborative interaction. Triangulated results confirmed that both feedback types positively influenced self-regulated writing behaviors, with AWEF demonstrating a stronger overall impact.
