The primary aim of this research was to evaluate the effectiveness of an interactive journal-based training program for learners in their fourth year at Almirante Miguel Grau Seminario Secondary School, Padrecocha 2021, in enhancing their English writing skills. The research type was evaluative employing a field study, contemporary transectional, univariate, and quasi-experimental designs with pre-test, post-test and control group. The research population consisted of 270 male and female students, with a non-probabilistic sample of 52, divided into two groups: 4th B the experimental group with 26, and 4th C the control group with 26 students. Post-test results revealed that the experimental group performed better than the control group, with a higher mean score (15,22 >10,11). Similar results were evident for its dimensions. In conclusion, the interactive diary-based learner-training pro...