Definitions of Error
Basic Tenets of Human Error
Human Factors Engineering
Human Performance
Types of Errors
Systems to Reduce Errors
Stroop Test
Swiss Cheese Model
Toxic Cascades
Lessons from Other Industries
Basic Safety Principles

Human Performance

Rasmussen classified human performance into 3 levels. In order of decreasing levels of familiarity with the task, these are:

  • Skill-based – stored patterns of pre-programmed instructions
  • Rule-based – familiar problems are addressed by application of stored rules
  • Knowledge-based – novel situations in which actions must be planned, using conscious analytic processes and stored knowledge

With increasing expertise, performance moves from knowledge-based toward skill-based. Click on the images below for examples.

Daily Life


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