Crisis intervention aims to help individuals experiencing acute distress or crisis. It focuses on the present situation and addressing immediate needs. Dr. Eric Lindemann pioneered crisis intervention through his research on grief responses. Crisis intervention draws from ego psychology and ecological systems theory. Key concepts include levels of crisis, stages of crisis, and models like the seven stage crisis intervention model and critical incident stress debriefing. While effective in many situations, crisis intervention could benefit from more research on cultural and demographic factors.