[gjvc]

Mishaps occur on a spectrum, and may be categorised from mistakes, carelessness, recklessness, through to malicious intent, and any combination of the above all along said spectrum.

Though these categories may seem like they are orientated on individuals' actions, they may be used to determine where the risk lies in systems (and people's use thereof) and how measures can be taken to avoid the same problems being repeated.

Much of the time, the complexity of systems (using the term in the widest possible sense) is under-estimated, and automated integrity checks are not used as religiously as they may be.