[Development of the proactive/reactive aggressiveness questionnaire for teachers: factor structure and psychometric properties].

Development of the proactive/reactive questionnaire for teachers: factor structure and psychometric properties. The main purpose of this study was to develop a proactive/reactive aggression questionnaire for children in Spanish, reported by teachers. To develop the questionnaire, we selected eight items from the most widely used questionnaires in English using the criteria of a group of experts.