The purpose of this quasi-experimental study was to developing web-based, anonymous reporting system to increase reporting of medication errors, blood transfusion errors and patient falls in pediatric units and to compare the computerized system with the written system already in use at the institution.This study was conducted in all pediatric units of a research hospital. All physicians and nurses working in these units agreed to participate in the study. All units were visited to introduce the new reporting system. The number and quality of the reports sent on the new system in years 2014 and 2015 were compared to the reports sent the previous year using the written system.There was considerable increase in rates of reporting: 234% increase in medication error reporting rate, and 100% increase in the reports of blood transfusion errors. One of the most important results of this study that near-miss errors were not reported at all while the written system of the study institution was being used, whereas it was the most commonly reported type of errors in the electronic error reporting system.The web-based reporting system, which makes reporting easy, promoted the development of safety culture among doctors and nurses in common language.