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Design work does not end when the first drawing is released. Products change. Understanding the difference between an engineering change request and an engineering change order helps designers control those changes.
What Is an ECR?
An Engineering Change Request is generally used to propose or request a change. It can document the problem, reason, affected components and suggested solution.
What Is an ECO?
An Engineering Change Order is typically the controlled instruction used to implement an approved change. Terminology varies between companies, so always follow the organization’s document-control process.
Why Traceability Matters
When a product is already in production, changing a drawing can affect purchasing, inventory, tooling, inspection and assembly. The change therefore needs more than a new CAD file.
Designer Checklist
- Identify affected part numbers.
- Record the reason for the change.
- Check existing stock and production.
- Update CAD, drawings and BOM consistently.
- Record the new revision.
- Communicate the effective date or implementation condition.
Good change control keeps engineering flexible without allowing uncontrolled versions into production.
Keep learning: Explore more practical engineering articles in the GetCADFile Design Guide.