Loved the links to Sidney Dekker books: http://sidneydekker.com/books/ and Charles Perrow's excellent 'Normal Accidents' http://press.princeton.edu/titles/6596.html You might also want to read Diane Vaughn's 'Challenger Launch Decision' http://press.uchicago.edu/ucp/books/book/chicago/C/bo2278192... and John Gall's 'Systemantics' https://en.wikipedia.org/wiki/Systemantics ('Complicated systems produce unexpected outcomes')