The piece focuses on how to effectively test Network Detection & Response (NDR) solutions. It outlines a framework for conducting realistic red team and adversary simulations, which are essential for evaluating the effectiveness of these security tools. The process emphasizes practical execution, ensuring that tests reflect real-world conditions to provide valuable insights. Key metrics are highlighted for measuring success. Instead of solely relying on the number of alerts generated during testing, the article stresses the importance of metrics like Mean Time to Detect (MTTD) and Mean Time to Respond (MTTR). These metrics provide a clearer picture of how an NDR solution performs under different scenarios. Finally, the article warns against common pitfalls in testing. It offers guidance on infrastructure setup, tool selection, and execution strategies. By addressing these areas, organizations can avoid mistakes that could lead to misleading results and ultimately improve their security posture.