Most of my students struggle with the blocked airway sequence with an unconscious patient. They tend to forget to check the mouth after each set of 30 compressions. Getting the student to focus on what they were doing and why they were doing it only helped to a small degree. Then I changed my approach; I told them there was two types of CPR - a patient with an open airway, or a patient with a blocked airway. I asked them, "What would be the difference?" They knew right away. Reduced the learning challenge in a big way.