Reasons for incomplete airway management documentation at baseline (Pareto Principle). The blue bars show how often each documentation element was missing from 23,011 general anesthesia records at baseline performance. They are ordered from most to least frequently missing from the records. The red line shows how many records would have been considered “complete” if the element had not been omitted. It is cumulative across the different elements. The Pareto Principle, as it is applied to process improvement, states that approximately 80% of the problem is caused by 20% of the contributing factors. In this case, the first four elements (~30% of all elements listed) are responsible for ~80% of incomplete records. LMA = laryngeal mask airway.