In industrial and regulated manufacturing environments, a work order is a formal, authorized instruction to perform defined work on a product, component, batch, or asset. It is both a planning object and a control record that ties the work to specific materials, documents, people, equipment, and timestamps.
Typical purpose of a work order
A work order is used to:
- Authorize work to be done (production, rework, maintenance, calibration, or inspection).
- Specify what must be done (operations, tasks, or steps).
- Reference how to do it (routes, travelers, work instructions, drawings, specifications).
- Identify which units are affected (serials, lots, batches, assets, locations).
- Capture evidence that it was done (signatures, timestamps, data, measurements, nonconformances).
Common types of work orders in regulated operations
- Production work order (or shop order): to build a defined quantity of a part or assembly, typically created from MRP/ERP and executed in an MES or on paper travelers.
- Rework or repair work order: to perform specific corrective work on nonconforming or returned product, often tied to a deviation or nonconformance record.
- Maintenance work order: to perform preventive or corrective maintenance on equipment, tools, or facilities, commonly managed in a CMMS or EAM system.
- Calibration work order: to perform calibration or verification on gauges and measurement systems, with results feeding back into metrology and quality records.
Key information usually contained in a work order
The exact fields vary by system (ERP, MES, CMMS) and by plant, but most regulated environments include:
- Identifiers: work order number, revision, plant/area, asset or line.
- Scope: part number or asset ID, quantity or specific units, type of work (build, inspect, rework, maintain).
- Linked documents: bill of materials, routing, work instructions, drawings, specifications, permits.
- Schedule & responsibility: required start/finish dates, assigned department or cell, responsible owner.
- Materials & resources: required components, tools, fixtures, test equipment, special processes.
- Execution records: operator or technician identifiers, timestamps, results, measurements, deviations.
- Approvals: electronic or physical signatures for creation, release, completion, and sometimes QA review.
How work orders relate to other systems
In brownfield environments, the work order typically sits at the intersection of multiple systems:
- ERP/MRP often creates production work orders for planning, costing, and inventory control.
- MES or line control systems use the work order to drive execution, data capture, and traceability at the operation level.
- QMS may reference work orders in nonconformance, CAPA, or deviation records, especially for rework and concessions.
- CMMS/EAM manages maintenance and calibration work orders for assets and equipment.
In many plants, these are only partly integrated, so the same work order ID might appear across systems, or separate IDs may need to be cross-referenced manually. How cleanly this works depends on integration quality, master data discipline, and change control.
Constraints and variations
- Naming differs: some sites use job order, shop order, process order, or batch record for similar concepts.
- Granularity varies: a single work order may cover an entire build, a specific operation, or only certain serial numbers or lots.
- Paper vs digital: many regulated plants still rely on paper travelers or mixed paper/digital records, which affects how the work order is created, updated, and archived.
- Regulatory impact: in aerospace, medical, and similar environments, work orders are part of the permanent quality record and must be controlled, versioned, and retained under formal procedures.
Because of these variations, when someone says “work order” in your facility, you usually need to clarify whether they mean a production order, maintenance order, rework order, or the combined traveler and record used on the floor.
