Master vs Executed Batch Records
Batch records are central to GMP manufacturing control. They document how a product is made and provide traceable evidence that each batch was produced in accordance with approved procedures. The documentation and execution discipline is described in Pharmaceutical GMP Compliance.
However, there is a critical distinction between:
The Master Batch Record (MBR)
The Executed Batch Record (EBR)
Confusing the two - or managing them poorly - is a frequent source of inspection observations.
This article explains their differences, roles, and regulatory expectations.
What Is a Master Batch Record (MBR)?
The Master Batch Record is the controlled template that defines how a product must be manufactured.
It includes:
Product name and code
List of raw materials and quantities
Equipment to be used
Step-by-step manufacturing instructions
In-process control requirements
Sampling instructions
Acceptance criteria
Labeling instructions
Required documentation entries
The MBR is approved before use and maintained under document control.
It defines intent.
What Is an Executed Batch Record (EBR)?
The Executive Batch Record documents how a specific batch was actually produced.
It includes:
Completed entries for each manufacturing step
Operator signatures or electronic approvals
Recorded in-process control results
Deviations or comments
Corrections and annotations
QA review and release decisions
The EBR provides objective evidence of execution.
It reflects reality.
The Relationship Between MBR and EBR
The MBR establishes the approved process.
The EBR documents adherence to that process.
The EBR should:
Follow the MBR structure
Capture required data points
Demonstrate that all steps were performed
Highlight any deviations from the master
If the MBR is poorly designed, the EBR will be difficult to execute properly.
Weak batch record design often leads to recurring documentation errors.
Control and Version Management of MBRs
Master Batch Records must be:
Formally approved
Version controlled
Protected from unauthorized modification
Periodically reviewed
Changes to the MBR must follow structured change control procedures, including risk-based impact evaluation as outlined in Risk-Based Change Control Assessment.
Impact evaluation should consider:
Process validation status
Training updates
Labeling implications
In-process control modifications
Poor version control of MBRs is a frequent regulatory finding.
Accuracy and Completeness of EBRs
Executed Batch Records must be:
Completed contemporaneously
Legible and traceable
Accurate and complete
Reviewed prior to batch release
Common EBR issues include:
Missing entries
Incomplete calculations
Unjustified corrections
Backdated signatures
Inconsistent sampling documentation
Batch record review is a key component of quality oversight.
Batch release decisions rely heavily on EBR integrity. These records also provide primary evidence that validated process parameters were followed during routine production.
In-Process Controls Within Batch Records
In-process control requirements defined in the MBR must be clearly reflected in the EBR.
This includes:
Defined sampling frequency
Acceptance criteria
Escalation procedures
Inadequate alignment between defined IPC requirements and executed documentation may indicate weaknesses in process control.
For IPC fundamentals, see In-Process Controls Explained.
Electronic vs Paper Batch Records
Organizations may use:
Paper-based batch records
Hybrid systems
Fully electronic batch record system
Regardless of format, regulators expect:
Controlled access
Audit trail integrity
Clear traceability
Data integrity safeguards
Electronic systems must ensure that approved master instructions are used during execution.
Poor configuration of electronic systems can result in version mismatch between master and executed records.
Deviation Handling Within Batch Records
If deviations occur during production:
They must be documented in the EBR
Appropriate investigation must be initiated
Impact on product quality must be assessed
Executed batch records must accurately reflect all manufacturing activities, including unplanned events or deviations.
Inspection Perspective
During inspection, regulators often:
Review selected executed batch records
Compare execution against master instructions
Evaluate completeness and clarity
Examine correction practices
Assess review and approval controls
Inspectors frequently identify:
Unclear instructions in the MBR
Repeated documentation errors
Failure to update master records following process changes
Insufficient review depth
Batch records often serve as the primary evidence of process control.
Weaknesses here may trigger deeper system review.
Practical Perspective
The Master Batch Record defines how a product should be manufactured.
The Executed Batch Record proves how it was manufactured.
A strong GMP system ensures that:
Masters are clear and controlled
Execution is accurate and contemporaneous
Deviations are documented transparently
Version control is maintained
Review processes are robust
When MBR design is disciplined and EBR execution is accurate, batch records become a powerful demonstration of manufacturing control rather than an inspection vulnerability.
