The paper emphasizes the importance of operational risk. Not only in banks and credit institutions, but also in any company, business and activity, the significance stems from the fact that operational risk is pervasive, it can appear in every process and every organizational part and in every activity. The only complete disappearance of operational risk from an activity, if we trivialize the point of view, would guarantee the absolute cessation of performing that activity, which is of course not possible if we want to do business. That is why operational risk is recognized, measured, monitored and reduced in order to manage it well, to control it and ultimately to minimize it. Not all activities are obliged to monitor it, but banks/credit institutions are subject to regulations in the field of operational risks, which prescribe mandatory monitoring and calculation of capital requirements for operational risks, and this obligation is prescribed by legislators and competent institutions. The professional and practical contribution of the paper is in the fact that after many years of professional work with all segments in the field of operational risk management, the author can present and share the acquired experience and knowledge from practice. The paper primarily explains the process of collecting data on operational risk events (Event data collection process – EDC) through examples of operational risk events that most often appear in the credit institution. An example of collecting data on operational risk events in a small credit institution is given, with accounting bases but also possible deficiencies during collection.