Which of the following terms refers to assessing what is happening at the scene and then using that information to devise a plan of action?

The term that best describes the process of assessing what is happening at the scene and using that information to devise a plan of action is size-up. Size-up involves a comprehensive evaluation of the incident's current situation, including identifying hazards, determining the resources needed, assessing the conditions, and understanding the dynamics involved. This initial assessment is critical for developing an effective strategy for managing the incident and ensuring the safety of both responders and civilians.

In firefighting and emergency response, effective size-up allows firefighters to make informed decisions based on real-time data. It includes observing elements such as the size and type of fire, the structure's condition, and potential risks to personnel and bystanders. By properly conducting a size-up, responders can prioritize actions and allocate resources more efficiently, ultimately improving the effectiveness of their response.