I am doing a research on the influnce of human intervention in faults. It is a quite a significant correlation between fault and human interaction during planned and unplanned maintenance. From the time I was a maintenance manager I remember it was common to implement the maintenance program the vendor suggested without much of questions. Then we did RCM and other analysis to improve and optimize the maintenance. But we (maintenance managers) had to agrue very hard to remove maintenance actions that we found unreasonable. The technicians who worked with the systems everyday had to argue even harder. So in light of the facts that human intervention seems to cause that many faults, should we not start arguing why you should do maintenance, instead of why you should let it be?