Aim To design and perform a face and content validation of a questionnaire to measure the competence of hospital RN to report medication incidents. Methods Content and face questionnaire validation descriptive study. A review of the literature was performed for the creation of items. A panel of six experts assessed the relevance of the inclusion of each item in the questionnaire by calculating the position index; items with position index >0.70 were selected. The questionnaire was piloted by 59 RN. Finally, a meeting was convened with experts, in order to reduce the length of the piloted questionnaire through review, discussion and decision by consensus on each item. Results From the literature review, a battery of 151 items grouped into three elements of competence: attitudes, knowledge and skills was created. 52.9% (n=80) of the items received a position index >0.70. The response rate in the pilot study was 40.65%. The median time to complete the questionnaire was 23:35min. After reduction by the experts, the final questionnaire comprised 45 items grouped into 32 questions. Conclusions The NORMA questionnaire, designed to explore the competence of hospital RN to report medication incidents, has adequate face and content validity and is easy to administer, enabling its institutional implementation.