The document summarizes Chapter 1 of the book "Crisis Intervention: The Criminal Justice Response to Chaos, Mayhem, and Disaster" by William Harmening. It defines crisis as an event that causes internal and external systems of control to become stressed, requiring third-party intervention. It discusses classifying crises based on their potential impact, the history of crisis intervention in America from the 1700s to today, and the five steps of modern crisis intervention: response, containment, de-escalation, remediation, and prevention.