There are four types of work orders in Plant Maintenance:
1. Demand Maintenance Order (DMO) – primarily used to perform corrective maintenance.
2. Preventive Maintenance Order (PMO) – preventive maintenance.
3. Project Work Order (PWO) – internally performed IJO work.
4. Operation Work Order (OWO) – common level of support work i.e. lawn maintenance, tree trimming, garbage pickup service, etc.