Social action is a macro social work practice that involves mobilizing masses to bring about structural changes in society or prevent adverse changes. It aims to achieve social progress by modifying policies, improving services and influencing legislation. Objectives include preventing needs, solving mass problems, and improving conditions. Principles include building credibility, legitimizing goals, dramatizing issues, using multiple strategies, and developing manifold programs. Models include elitist and popular action. Popular action involves conscientization, dialectical approaches, and direct mobilization of masses. Gandhian and Alinsky models also use mass mobilization and action for change.