Screen-based computer simulations are considered a method of skill teaching in health education. This study examined the effect of screen-based computer simulation on knowledge, skill, and the clinical decision-making process in teaching preoperative and postoperative care management to second-year students in an undergraduate school of nursing. It is a randomized controlled study. The study sample was composed of 82 students. They received education in screen-based computer simulation (n = 41) and skill laboratories (n = 41). Three instruments were used: a preoperative and postoperative care management cognitive level assessment test, skill control lists of preoperative and postoperative care management, and the Clinical Decision Making in Nursing Scale. There was not a significant difference between the students’ posteducation knowledge levels (P = .421), practical deep breathing and coughing exercise education skills (P = .867), or clinical decision-making scale total and subscale scores (P = .065). However, a significant difference was found between the admission of the patient in the surgical clinic after surgery skill scores of the students (P = .04). Education provided in the screen-based computer simulation laboratory was equivalent to that provided in the skill laboratory.