Which of the following is NOT a step in Emergency Scene Management?

The correct answer is medical history, as it does not constitute a step in Emergency Scene Management. In the context of emergency scenes, the focus is primarily on ensuring the safety of the environment, assessing the situation, and providing immediate care to the casualties present.

Scene Survey involves a thorough assessment of the surroundings to identify potential hazards, ensuring that the responder can act safely and effectively. The Primary Survey is a systematic approach to assess the casualty for life-threatening conditions, focusing on airway, breathing, circulation, and disability, which are critical for determining the urgency of care needed. Ongoing Casualty Care refers to the continued assessment and monitoring of a casualty's condition while waiting for emergency services to arrive or while preparing to transport them.

Gathering a medical history is essential in the broader context of patient care but is not a step necessary for managing the emergency scene itself. A medical history would typically be collected after ensuring the safety and initial assessment of the casualties.