1. Introduction -- 2. Accidents caused by simple slips -- 3. Accidents that could be prevented by better training or instruction -- 4. Accidents due to lack of physical or mental ability -- 5. Accidents due to wrong decisions -- 6. Accidents due to management errors -- 7. The probability of human error -- 8. Some accidents that could be prevented by better design -- 9. Some accidents that could be prevented by better construction -- 10. Some accidents that could be prevented by better maintenance -- 11. Some accidents that could be prevented by better methods of operation -- 12. Errors in computer-controlled plants -- 13. Personal and managerial responsibility -- 14. The adventures of John Doe -- 15. Some final thoughts