Incompetence should probably be number one. There is a big difference between someone making a mistake due to unclear or incomplete process and someone doing t

Incompetence should probably be number one. There is a big difference between someone making a mistake due to unclear or incomplete process and someone doing that mistake because they are not competent to perform that task. This then raises the issue that hiring and leaving incompetent people in place is itself proof of an organisational incompetence...