A rule was not followed
So it feels a little more serious here. A rule or procedure was not followed, and this either led to an incident or increased the risk of an incident happening. Also, this goes against the basic safety agreement: We follow the best known procedures and practices to achieve our safety outcomes.
This is the correct level if you find that a rule has not been followed because either the rule or procedure was not known, or (not unlikely) not clear enough / not understandable or contradictory with another rule. If that seems to be the case, click "next".
From the literature we could call this "unintended violations". They are the result of people not knowing how to apply procedures properly due to:
Sometimes people act as if there is no procedure at all, due to: