There are many things experts can see that are invisible to everyone else: Patterns that novices do not notice. Anomalies—events that did not happen and other violations of expectancies. The big picture (situation awareness). The way things work. Opportunities and improvisations. Events that either already happened (the past) or are going to happen (the future). Differences that are too small for novices to detect. Their own limitations. These aspects of expertise can be tied to the two primary sources of power we have been examining: pattern matching and mental simulation.
