The planning function is done primarily to improve efficiency. Planned work is typically measured as requiring one-third of the labor time as unplanned work. The planner is less likely to be diverted to other responsibilities, and more likely to have the time for careful analysis. There are other benefits. During times such as vacation, there are backups available to plan.
Planning is a discipline that is difficult to achieve and difficult to maintain.
It needs to be nurtured and developed carefully. This is the greatest issue to maintenance improvement in most plants. A key to developing a valuable history is complete documentation of the actual work performed. The planner must be the coach to assure that work is documented according to plant standards. Planners are the only staff in a position to understand and review the work.