Understanding the influence of human factors on team and system performance can help safety professionals identify opportunities for improvement. In this study, researchers used a large, centralized incident reporting database in the United Kingdom to examine the human factors contributing to non-procedural endoscopy-related patient safety incidents. Based on Human Factors Analysis and Classification System coding, decision-based errors were the most common factor contributing to incidents, but other contributing factors were also identified, including lack of resources and ineffective team communication.