Background. Research and written communication skills are essential in undergraduate medical education, because medical doctors are often involved in research, and written communication is part of a medical doctor´s everyday routine. Academic medical programs that include training in clinical or epidemiological research require written communication aptitudes. Constructive feedback is a review technique commonly employed in medical education that involves the professor´s close surveillance of the student’s performance and a clear communication to respectfully explain to students their strengths, weaknesses and opportunities of improvement, while ensuring a fair evaluation. Even though constructive feedback is common in clinical practice, it is rarely used in undergraduate medical training in scientific writing. Objective. To evaluate the impact of constructive feedback on the academi...