Audit-Ready eSignatures and eRecords in the Plant

Electronic signatures and records are essential under 21 CFR Part 11 — but implementing them correctly requires engineering rigor. An “audit-ready” system captures not only data but also context: who approved what, when, and under which conditions.

Core Requirements

• Unique user identity: No shared accounts or group logins.
• Two-factor authentication: Signature must confirm intent, not just presence.
• Linked audit trail: Signatures stored alongside associated records and timestamps.

System Design Principles

• Separate signing from logging in — each signature event must stand alone.
• Include reason fields (“reviewed,” “approved,” “verified”) for traceability.
• Ensure PDF or XML exports preserve signatures and checksums.

Case Example: MES in Fill-Finish Facility

A fill-finish plant implemented digital sign-off in its MES workflows. Each step required dual eSignatures for critical operations. Audit prep time dropped from 3 days to 3 hours.

Related Articles

• CSV and 21 CFR Part 11 for Automation Engineers
• Batch Records That Pass: eBR/eDHR Design Patterns
• Deviation, CAPA, and Change Control: An Automation View

Conclusion

eSignatures and eRecords only prove compliance when context is complete. Build systems that record intent and accountability — not just actions.