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# Best Practices for Implementing IEC 62443 within Existing OT Security Frameworks
- URL: https://www.cybrsecmedia.com/best-practices-for-implementing-iec-62443-within-existing-ot-security-frameworks/
- Published: 2026-04-20T14:30:04.000Z
- Updated: 2026-04-20T14:30:04.000Z
- Author: Lauren Andrus
- Tags: OT.SEC.CON. 2026, video, OT Security

**Presenter:**

[Brendan Clemmer](https://www.linkedin.com/in/clemmer/?ref=cybrsecmedia.com)

This talk focuses on applying IEC 62443 in real-world OT environments, making the point that most organizations struggle not with the framework itself—but with integrating it into messy, existing systems.

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## **Key takeaways**

- **Frameworks don’t fail—implementation does**
  - IEC 62443 provides solid guidance
  - The challenge is translating it into **existing, imperfect environments**
  - Organizations stall trying to map theory to reality
- **You can’t start from scratch**
  - Most OT environments are legacy-heavy
  - No greenfield deployments
  - Security has to be layered into what already exists
- **Maturity matters more than compliance**
  - Checking boxes ≠ reducing risk
  - Organizations need to assess where they actually are
  - Progress should be incremental, not all-or-nothing
- **Zones and conduits require real understanding**
  - Segmentation isn’t just diagramming networks
  - Requires knowledge of **process flows and dependencies**
  - Poor implementation can break operations
- **Cross-functional alignment is essential**
  - IT, OT, and engineering all play roles
  - Framework adoption fails without shared ownership
  - Governance has to connect technical and operational teams
- **Prioritization is key**
  - You can’t implement everything at once
  - Focus on highest-risk assets and processes first
  - Build toward maturity over time

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