If an act, event or accident occurs which the teacher could have foreseen, whether or not the teacher is found to have been negligent will depend on whether or not the teacher had a duty of care. The liability of teachers will depend on whether they acted [act, to] as reasonable people would. The liability of teachers may be mitigated by the fact of whether or not students were able to understand the danger and possibility of harm and then chose to proceed in a situation, thereby placing themselves in peril. The liability of teachers will depend upon actual harm occurring to the students and the teacher's behavior or breach of the duty of care being the legal cause of that harm. If one of these four standards is missing, the act is not negligent.