What do you consider to be an event worthy of investigation? Do you look only at events that had serious consequences, or do you consider less serious events as well? What about near-misses?
I've recently been involved in the investigation of a near-miss event. By near-miss (or near-hit?), I mean an event that almost happened -- an event that terminated one step before a serious consequence was experienced. As is often the case, the event sequence was a seeming string of coincidences. It ended without consequence simply because there was nobody at the event location to be injured.