A work order can be of a Planned nature (coming from an already established scheduled task plan) or Unplanned (coming from a work order request or some ad-hoc activity not contemplated in a task plan). For this reason, 2 different ways of managing work orders are required.
Planned work orders
Unplanned work orders
It should be noted that in most organisations and industries, up to 90% of all work orders generated will be Unplanned.