Action research is an interventionist qualitative research method that involves collaborating with an organization to address a real-world problem and create positive change through a cyclical process of planning, action, evaluation, and reflection. The researcher works with practitioners to agree on a relevant problem area, plan interventions informed by relevant theory, study their effects on the organization through data collection methods, and reflect on learnings to both address the problem and contribute to the theoretical body of knowledge. Key principles include the researcher-client agreement, the cyclical process, relating practical problems to abstract theory, creating change through action, and learning through reflection.