Put these in correct order: Perform assessment, Check for Responsiveness, Size-up the scene, Summon advanced medical personnel.

The correct order is based on the systematic approach required in emergency response to ensure safety and effectiveness in providing assistance.

Starting with sizing up the scene is crucial because it allows you to assess the safety of the environment and identify any potential hazards that could pose a risk to you or the victim. This initial observation is fundamental in establishing whether it is safe to approach and assist the individual needing help.

Once the scene is secure, checking for responsiveness comes next. This involves assessing whether the person is conscious and able to respond to verbal or physical stimuli. A responsive person might indicate less urgency than an unresponsive one, influencing your subsequent actions.

After checking responsiveness, performing an assessment of the individual’s condition is essential. This includes evaluating their airway, breathing, and circulation to identify any immediate medical needs or life-threatening issues.

Finally, summoning advanced medical personnel is the last step of this sequence. Once you have evaluated the situation and determined the need for further medical assistance, you can call for help while continuing to provide care based on your assessment. This systematic approach maximizes the victim's chances of recovery and ensures that help is on the way while you provide initial care.