Doing the same thing over and achieving a different outcome.
Mostly I have been investigating a problem today, mostly. I suspect it occurs when people don't follow the correct procedure. Some people think this is reason enough to say it is not our problem any more, it's their problem for not following the correct procedure. However I have discovered the procedure is impossible to execute in some cases. Whether these cases are the problem cases I have not established because when I execute the procedure incorrectly I do not get the problem. I get other similar problems, but not the problem as described. Interestingly, I executed the same incorrect procedure twice and achieved different results: one result had a problem similar to the problem I was investigating; the other did not have a problem at all. I think the solution lies in fixing the procedure so it is no longer impossible to execute in some cases. Other people still think it is not our problem any more.