chapter 1. Introduction -- chapter 2. Variability in human motor and sport performance -- chapter 3. Variability in cognitive and psychomotor performance -- chapter 4. Educational ergonomics : context specificity in student learning -- chapter 5. Variability in human performance under displaced sensory feedback -- chapter 6. Human error and performance variability -- chapter 7. Variability in affective performance -- chapter 8. Social cybernetics of team performance variability -- chapter 9. Variability in human work performance : interaction with complex sociotechnical systems -- chapter 10. Variability in fracture-critical systems -- chapter 11. Human performance variability : an evolutionary perspective -- chapter 12. Summary and conclusions.