Change Control

💬 In Plain Words: Once a Manufacturing Execution System (MES) is validated and running production (like batch 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? 🗺️ 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 └── Revalid...

💬 In plain words: Regulatory guidelines ( GxP ) do not expect absolute perfection where nothing ever goes wrong. What they do expect is that when problems happen, they are immediately reported, thoroughly investigated, and permanently fixed in a highly controlled way. 📌 Example: A laboratory refrigerator goes slightly above its approved temperature limit. You must never change the log to make it look "normal." Instead, you protect the affected material, report the event, document the deviation, and scientifically assess if the product was impacted. 🎬 Real-Life Scenario: The Temperature Excursion A stability sample refrigerator reaches 11°C, but the officially approved range is 2–8°C. The Old/Bad Way: Reset the alarm, write down "8°C," and keep working just because the temperature eventually went back to normal. Why it's bad: The event is completely hidden, the record is falsified, and nobody actually know...