Manufacturing environments are constantly evolving. Products are refined, processes are improved and issues are corrected. To navigate this evolution, organizations need an effective framework for the management of change.
Changes must be handled in a structured and strategic manner to maintain quality, compliance and operational efficiency. Engineering change orders (ECOs) provide a formal mechanism for implementing approved changes and ensuring manufacturers have complete, accurate and timely documentation of all changes on hand.
What is an engineering change order (ECO)?
An engineering change order is a formal approval and implementation document that provides formal instruction for teams to carry out the described change(s).
It is commonly used for changes such as:
- Design updates
- Material substitutions
- Manufacturing process changes
- Supplier changes
- Quality improvements
The nature of manufacturing processes means that changes are both inevitable and ongoing. ECOs formalize changes to provide clarity, enhance traceability and ensure complete documentation. This provides a single source of truth for all changes in the case of a malfunction, audit or the need for additional modifications.
ECO vs. ECN vs. ECR
ECOs are connected to two other processes known as engineering change notices (ECNs) and engineering change requests (ECRs). Here’s a quick comparison.
Factor | Engineering Change Request (ECR) | Engineering Change Notice (ECN) | Engineering Change Order (ECO) |
Primary purpose | Proposes or suggests a change | Communicates an approved change | Authorizes and implements the approved change |
Stage in change process | Initiation stage | Communication stage | Execution stage |
Who creates it | Engineers, technicians, operators, quality teams, and customers | Engineering or change control team | Engineering/change control authority |
Main function | Identifies problem, improvement or opportunity | Notifies stakeholders of approved modification | Formal instruction to carry out the change |
Level of detail | Problem description and justification | Description of change and affected areas | Detailed execution plan, timelines and responsibilities |
Impact analysis | Preliminary impact consideration | Communicates analyzed impact | Includes full impact assessments and action steps |
Typical content | Issue description, rationale and suggested solution | Change summary, affected documents/products | Implementation steps, approvals and documentation updates |
Audience | Engineering and review teams | Cross-functional stakeholders | Production, quality, maintenance, procurement, and supply chain |
Outcome | Decision whether to proceed | Awareness and alignment | Change execution and validation |
Why engineering change orders are important in manufacturing
In combination with ECRs and ECNs, ECOs enable confidence and consistency. These three processes follow a linear path: ECRs propose a change, ECNs communicate change details once they are approved, and ECOs describe where, when and how changes will take place. Once changes have been implemented, evaluating their impact helps inform the next round of ECRs.
Consistent use of ECOs offers multiple benefits for businesses, including:
- Maintaining product quality and consistency
- Preventing production errors and rework
- Enabling regulatory and compliance alignment
- Supporting traceability and audits
- Ensuring customer satisfaction
- Minimizing operational disruption
Failure to implement formal change management processes may not lead to immediate fallout; machines will continue to operate, and processes will remain largely unchanged. Problems occur, however, when manufacturers experience unplanned downtime or are subject to OSHA inspections or other compliance audits. Without complete change documentation, teams may be unable to locate the root cause of systemic failures, and businesses may be at risk of fines or sanctions if failures create safety risks.
The engineering change order process
ECOs focus on the execution of approved changes. But these changes don’t happen overnight; instead, they typically follow a standardized workflow.
Step 1: Change identification
First is identifying the change(s) needed to improve processes, reduce errors or enhance production reliability.
Step 2: Engineering Change Requests
Next is the creation of ECRs, which document and detail proposed changes.
Step 3: Impact analysis
Impact analysis follows. What are the potential outcomes of change beyond its stated purpose? This step helps companies consider the big picture: If X operation is changed, what does that mean for Y and Z processes?
Step 4: Cross-functional review
Before changes are authorized, multiple teams should have the chance to review and comment on the proposal. This is because different teams have different perspectives on change impacts. Maintenance teams may be worried about increased failure risk, while production floor managers may be concerned about cycle time increases.
Step 5: Approval and authorization
Once changes have been assessed and reviewed, they are approved and authorized using an ECN.
Step 6: Implementation planning
With an ECN in hand, teams can start implementation planning. Implementation covers timelines, materials, processes, and potential pitfalls.
Step 7: Documentation updates
When implementation plans are in place, manufacturers can update documentation to reflect approved changes and any associated knock-on effects, such as shifts in the type and number of spare parts needed.
Step 8: Verification and validation
The final step before changes are implemented is verification and validation. Tests here can help catch issues that have slipped through the cracks and prevent unexpected downtime.
Step 9: Communication and rollout
Rollout of new changes is the final step, paired with communication to all affected staff members and stakeholders. Keeping teams in the loop reduces the risk of production line conflicts.
Effective implementation of ECOs also requires collaboration across multiple departments. These include engineering, quality control, operations management, parts procurement, and maintenance teams. This is because even small changes can have far-reaching impacts on manufacturing processes.
Types of engineering change orders
Engineering change orders come in multiple forms, depending on the nature of the change request. Common types include:
- Design ECOs – Design ECOs apply to product designs that may need updating or correction to ensure consistency.
- Process ECOs – Process ECOs refer to operations. They may be tied to equipment functions or staff practices that require optimization.
- Material ECOs – Material ECOs may be used to change the materials used in product production or the materials required for equipment maintenance.
- Supplier ECOs – Supplier ECOs can be used to completely change suppliers as costs or logistics demand. They may also be used to change the quantity or type of supplies ordered.
- Documentation ECOs – Documentation ECOs change the way documents are completed, handled and stored within digital systems.
- Corrective ECOs – Corrective ECOs look to address and resolve quality control issues that lead to rework or scrap.
- Preventive ECOs – Preventive ECOs implement new reliability-centered maintenance processes aimed at continuous improvement tied to increased machine uptime.
Impact of ECOs on manufacturing operations
ECOs don’t exist in a vacuum. Changes made to operations, technology or production can have far-reaching consequences for other manufacturing processes.
For example, implementing changes may require production scheduling adjustments to account for planned downtime. In addition, teams may need to consider inventory obsolescence, tooling and setup changes if ECOs include the upgrade or replacement of current equipment.
Manufacturers must also account for training and workforce readiness. Consider the implementation of IIoT sensors that provide real-time asset data. Effectively tracking, collecting and using this data may require additional knowledge or skills; companies must budget both the time and money required for training.
Other considerations include quality control implications as changes move from testing to implementation, maintenance and reliability issues as new processes interact with existing frameworks, and supply chain alignment to ensure teams have the right spare parts on hand to address issues without extending downtime.
Best practices for effective ECO management
Effective ECO management depends on streamlined workflows, reduced disruption and minimized risk. Eight best practices can help achieve these goals:
1. Standardize ECO procedures
2. Create clear roles and responsibilities
3. Implement strong change impact analysis
4. Centralize documentation control
5. Enable digital ECO workflows
6. Build effective communication plans
7. Prioritize training and workforce engagement
8. Follow up with post-implementation reviews
The role of technology in ECO management
Technology also plays a role in effective ECO management. Common tech integrations include:
- Product lifecycle management (PLM) systems for change control
- Enterprise resource planning (ERP) tools for production alignment
- Manufacturing execution systems (MES) for scheduling
- Computerized maintenance management systems (CMMS) to help track maintenance impacts
- Version control and digital documentation solutions to create a single source of truth
- Data analytics to measure change performance
- Automation and workflow management frameworks to reduce error risks
When used correctly, digital tools improve ECO execution by helping teams focus on implementing and validating changes, rather than chasing revision updates, approvals and documentation across various teams.
For example, integrating CMMS, MES and ERP systems provides increased operational visibility.
How ECOs support continuous improvement and reliability
ECOs aren’t just documentation for authorized changes; they offer a way for manufacturers to enhance reliability, support continuous improvement and drive operational excellence.
In practice, effective ECR, ECN and ECO processes offer key business benefits such as:
- Root cause resolution through design changes
- Standardization and process optimization
- Reduced maintenance issues
- Improved equipment reliability
- Alignment with lean and quality initiatives
- Enabling innovation without sacrificing control
Accessing these benefits starts with the right strategy. With more than four decades of experience helping businesses meet reliability, maintenance and operational goals, ATS can help teams create consistent engineering change processes that enable data-driven manufacturing.
From maintenance expertise during process transitions to reliability insights during change decisions, workforce training to ensure available skills and access to skilled reliability engineers and maintenance engineers, ATS is your trusted partner for navigating the constant process of change. Let’s talk.
