This document discusses the importance of interagency cooperation across different government organizations. It notes that issues like counterterrorism, law enforcement, emergency response, border security, and cybersecurity require integrated responses from multiple agencies. The document outlines some key elements of effective interagency cooperation, including understanding different agency cultures, strategies, intelligence approaches, technology uses, third parties, and evaluations. It provides definitions and models of interagency cooperation at the global, national, and local levels for issues like counterterrorism and law enforcement.