B10025), you cannot simply edit the software's code because "someone asked for a new feature."
Change control is the strict, governed process used to evaluate, approve, test, and document any modification. Before touching the production environment, you must ask: What could this change break? Does it compromise data integrity? What requires re-testing?
๐บ️ Topic Map: The Change Control Lifecycle
MES CHANGE LIFECYCLE
├── Change Request
│ ├── What is changing?
│ └── Why is it changing?
├── Impact & Risk Assessment
│ ├── Manufacturing operations
│ ├── Quality & Compliance
│ ├── Data Integrity
│ └── Validation status
├── Testing Strategy
│ ├── Risk-based testing (CSA approach)
│ └── Regression testing
├── Formal Approval
└── Production Release
├── Deploy
├── Post-deploy verification
└── Revalidate (if necessary)
๐ B10025 Example: Changing a Material Rule
The MES validates that only approved material lots can be used to manufacture batch
B10025.The New Request:
A developer wants the MES to also verify that the material has not expired before allowing its use.
The Impact:
This isn't just a quick code update. The team must assess the impact on material validation, operator workflows, batch execution speed, Electronic Batch Record (EBR) evidence generation, and overall quality risk. The modification must go through a formal change control process before it ever sees the factory floor.
๐ญ Why Does MES Need Change Control?
In the pharmaceutical industry, an MES doesn't just display data—it actively manages regulated manufacturing processes and generates legal production records.
- Critical Operations: MES directly controls manufacturing workflows.
- Compliance Records: It generates the
EBR(Electronic Batch Record). - Domino Effects: A minor update can unexpectedly alter workflows, calculations, audit trails, and electronic signatures.
- Risk Management: A seemingly small technical tweak can trigger a massive compliance or product quality failure.
๐ Conducting an Impact Assessment
Before any coding begins, an impact assessment determines which parts of the business or system could be disrupted. You must evaluate the effect on:
- Manufacturing workflows and operator efficiency
- Electronic Batch Records (
EBR) output - System audit trails and electronic signatures
- Overall Data Integrity (ALCOA+ principles)
- Integration points (e.g., ERP systems like SAP, or shop-floor equipment)
- Existing validated functionalities
- Standard Operating Procedures (SOPs) and operator training
A development team updates a single text field on the
B10025 execution screen. It seems trivial. However, that specific field is permanently mapped to the final EBR output. Because this alters stored compliance data and the system's audit trail, the impact is severe. Always judge a change by what it affects downstream, never by how small the code diff looks.
๐งช Modern Testing & Revalidation
Modern validation frameworks, such as the FDA's Computer Software Assurance (CSA), emphasize focusing your testing efforts where the risk is highest.
- Risk-Based Testing: Not every update requires identical testing. The scope of your test scripts should scale with the documented risk to product quality and patient safety.
- Regression Testing: Ensuring the new code didn't break old features. If you update the material verification rule for
B10025, you must also regression-test related dispensing, blending, and batch-completion workflows. - When is Revalidation Needed? Full revalidation is required when a change alters the fundamental validated state or intended use of the system (e.g., major workflow overhauls, modifying critical calculations, altering data integrity controls, or changing core ERP interfaces).
Rule: All controlled MES modifications must be formally assessed, approved, tested, and documented prior to release.
Gain: Safeguards the validated state, ensuring regulatory compliance and preventing manufacturing shutdowns.
Price: Introduces overhead in planning, documentation, testing, and approval workflows.
Limits: A robust change control process cannot magically fix a poorly written business requirement.
At Scale: Facilities with frequent deployments require robust IT governance, automated regression testing, version control, and strict release management.
๐จ Handling Emergency Changes
Even in a crisis (e.g., a critical bug halting production), an emergency change does not mean an uncontrolled change. Regulated sites have expedited emergency-change procedures. Pre-approval, targeted testing, and mandatory post-deployment documentation are still strictly required to maintain GMP compliance.
Wrong Answer: "Every time we update the MES, we have to completely revalidate the entire system."
Better Answer: "Every change requires an impact and risk assessment. The results of that assessment dictate the scope of testing and determine whether a partial or full revalidation is necessary based on risk."
๐ฏ Core Q&A
Q: How would you handle a user request to modify a validated MES workflow?
A: I would start by raising a formal change request, followed by an impact and risk assessment. Based on that, I'd identify affected functionalities, define a risk-based testing plan, secure approvals, build the change in a sandbox, execute the tests, and only deploy to production once Quality Assurance provides final sign-off.
Q: A developer insists that changing the batch execution screen is "just one line of code" and wants to bypass change control. What do you do?
A: Deny the bypass. Code size never dictates compliance risk. We must assess what business workflows and validated functions that single line of code interacts with.
Q: A proposed update will slightly modify how the audit trail logs data. How should this be handled?
A: This is an automatic high-impact change because audit trails are the backbone of Data Integrity (Part 11/Annex 11). The assessment will likely mandate rigorous testing and a targeted revalidation of the system's compliance controls.
✅ Quick Knowledge Check
- What is Change Control? The governed process to safely introduce system changes.
- What is an Impact Assessment? Evaluating what downstream systems, records, or workflows a change might disrupt.
- What is Risk-Based Testing? Scaling your testing effort based on the severity of the potential risk.
- What is Regression Testing? Verifying that new changes didn't accidentally break existing functionality.
Initial validation protects the approved state of your MES. Change control protects that state for the rest of the system's lifecycle.
When dealing with batches like
B10025, never just ask, "Does the new feature work?" You must always ask, "What else did it affect, and is our validated state still secure?"