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Performance Levels

Different error types are often associated with what are termed performance levels. At any point in time, a person usually performs several tasks simultaneously. For example, a pilot may be flying the aircraft manually (reading instruments, analysing the situation and giving inputs to flight controls), going through the checklist read by the pilot not flying (PNF) and remaining vigilant for any radio traffic. In order to be capable of such multi-tasking, despite limited attention resources, human cognition is able to perform familiar tasks with minimal attention and the most familiar tasks automatically.

This capability can be modeled with Rasmussen’s skill-based, rule-based, knowledge-based presentation of performance levels. Rasmussen’s model is briefly introduced below.

Applying learned routine skills in normal, well-known situations is skill-based performance.