Learn the fundamentals of Good Documentation Practice (GDP) in GMP environments. Discover GDP principles, documentation rules, data recording standards, corrections, and compliance requirements for pharmaceutical and manufacturing industries.

Good Documentation Practice (GDP): Complete Guide for GMP Documentation

Good Documentation Practice (GDP) refers to a structured system for preparing, reviewing, approving, issuing, recording, storing, and archiving documents. These practices ensure that all activities within a GMP (Good Manufacturing Practice) environment are accurately documented, traceable, and compliant with regulatory standards.

In regulated industries such as pharmaceuticals, biotechnology, and medical device manufacturing, Good Documentation Practice (GDP) plays a critical role in ensuring data integrity, product quality, and regulatory compliance.

Importance of Good Documentation Practice (GDP)

A fundamental principle in GMP documentation states:

“If it is not written down, then it did not happen.”

This statement highlights the importance of proper documentation in regulated environments.

Proper GDP documentation helps organizations:

Record who performed the activity
Document when and where the task occurred
Explain why and how the activity was performed
Provide evidence that procedures were followed correctly

Well-maintained records serve as proof during audits, inspections, and regulatory reviews.

Basic Requirements of Good Documentation Practice (GDP)

The following principles form the foundation of GDP compliance:

Record all entries at the time the activity is performed.
Always include date and signature in GMP records.
Use indelible ballpoint pens when recording data.
Enter data directly into approved GMP records in English.
Do not use pencils or erasable ink.
Avoid white ink or correction fluid for corrections.
Never sign documents on behalf of someone else.
Do not backdate records.
Never discard original raw data.
Avoid using loose papers, scratch papers, or sticky notes.
Do not destroy records before the retention period expires.
All documents used in manufacturing and supporting processes must comply with Good Documentation Practice (GDP) requirements.

Types of Documents Covered Under GDP

Good Documentation Practice applies to many types of GMP documentation, including:

Batch Manufacturing Records (BMR)
Bill of Materials (BOM)
Product Specifications
Standard Operating Procedures (SOPs)
Validation Protocols
Test Methods
Checklists
Forms and Log Sheets
Training Assessments
Certificates of Analysis (COA)
Technology Transfer Documents
Validation Reports
Maintenance Records
Calibration Records

This list is not exhaustive; any document impacting GMP operations must follow GDP standards.

General Requirements for GMP Documentation

1. Clearly Written Documentation

All documents must be:

Accurate
Clear
Consistent
Easy to understand

Related documents such as SOPs and forms should reference each other to maintain traceability using document numbers or identification codes.

2. Use of Indelible Ink

To ensure long-term readability:

Use black or blue indelible ballpoint pens
Do not use pencils or erasable ink

3. Legible Handwritten Entries

Entries must always be clear and readable.

Key requirements include:

Writing entries at the time the task is performed
Including signature and date
Ensuring handwriting is legible and understandable

The same principles apply to electronic records.

4. Review and Approval Process

Every GMP document should be:

Reviewed by qualified personnel
Approved before use
Signed and dated by the reviewer

Unsigned documents are considered incomplete and invalid.

5. Employee Signature Control

Employee signatures must be:

Unique to each individual
Registered in a signature register
Traceable to the responsible employee or contractor

Employees should never sign for another person, unless formally authorized.

The signature register must be maintained and updated during employee onboarding and exit.

Preparation of GMP Documents

When preparing documents under Good Documentation Practice (GDP), the following guidelines should be followed:

Use clear and descriptive titles for headings and tables.
Number pages using X of Y format.
Define abbreviations when used for the first time.
Include preparer, reviewer, and approver signatures with dates.
Provide effective date, approval date, and version number.
Follow the relevant SOP for document creation.
Use simple and understandable language.
Maintain adequate spacing and formatting for readability.
Provide sufficient background information for future users.
Use tables, charts, and diagrams when necessary.
Training on new documents must be completed before the effective date.

Issuance and Retrieval of GMP Records

Effective control of GMP forms and records is essential.

Key practices include:

Forms should be linked to their respective SOPs.
Quality Assurance (QA) should maintain a master list of GMP forms.
Records of form issuance and retrieval must be maintained.

Recording Date and Time in GMP Records

GDP requires standardized date and time formats.

Time Format

Use the 24-hour format (HH:MM).

Examples:

11:05 AM → 11:05
11:05 PM → 23:05

Date Format

Use DD.MM.YY format.

Example:

27 July 2013 → 27.07.13

Data Recording Requirements in GDP

When recording GMP data:

Use approved formats issued by QA
Enter data in chronological order
Do not pre-fill records
Ensure entries are made by trained and authorized personnel
Record data exactly as displayed on equipment
Document any unusual observations
Avoid using ditto marks or “as above”
Ensure second-person verification for manual entries

Raw data printouts must be signed, dated, and attached to the corresponding record.

Correcting Errors in GMP Records

Corrections must follow strict Good Documentation Practice (GDP) guidelines.

Rules include:

Do not overwrite incorrect entries.
Strike through the error with a single line so it remains readable.
Write the correct entry nearby.
Add initials, signature, and date.
Document the reason for correction.

Whenever possible, the original person who made the entry should perform the correction.

Handling Missing Entries in GMP Records

Sometimes entries may be missed during operations.

In such cases:

The entry can be added later only if data is retrievable
Record both the activity date and entry date
Provide a documented explanation for the delay

If the data cannot be retrieved, the issue must be handled through an event investigation process.

Handling Blank Spaces in GMP Records

Blank spaces in records must be:

Crossed out with a single line
Signed and dated

This prevents unauthorized additions later.

Cancellation of GMP Records

Cancellation of GMP records is allowed only in exceptional situations, such as:

Chemical spills on documents
Severe damage to the record

The process requires:

Quality Assurance (QA) approval
Documentation of the reason for cancellation
Signatures from the area in-charge and QA

An event investigation procedure should also be followed.

Frequently Asked Questions (FAQs)

1. What is Good Documentation Practice (GDP)?

Good Documentation Practice (GDP) is a set of guidelines used in GMP environments to ensure that documents are accurate, traceable, complete, and compliant with regulatory standards.

2. Why is GDP important in GMP?

GDP ensures data integrity, traceability, and compliance. Proper documentation also provides evidence during regulatory inspections and audits.

3. What type of pen should be used for GMP documentation?

GDP requires the use of indelible black or blue ballpoint pens to ensure long-term readability of records.

4. Can pencil be used in GMP records?

No. Pencils and erasable ink are not allowed because entries must be permanent and tamper-proof.

5. How should errors be corrected in GMP records?

Errors should be corrected by drawing a single line through the incorrect entry, writing the correct information nearby, and adding signature, date, and reason for correction.

6. What happens if a GMP entry is missed?

If the data is retrievable, the entry can be added later with a clear explanation and proper documentation. Otherwise, it may require investigation.

7. What is the standard time format used in GMP documentation?

GDP requires the 24-hour time format (HH:MM).

8. Can someone sign a GMP document on behalf of another employee?

No. Employees must only sign for work they performed themselves unless formally delegated.

9. What are examples of GMP documents?

Examples include batch manufacturing records, SOPs, calibration records, validation documents, certificates of analysis, and training records.

10. Who is responsible for maintaining GDP compliance?

GDP compliance is typically managed by Quality Assurance (QA), but all employees involved in GMP activities must follow documentation practices.