Which mechanism ensures that changes to safety-related software are verified by an independent party?

Which mechanism ensures that changes to safety-related software are verified by an independent party?

• A. Change control with independent validation.
• B. Loose governance to speed changes.
• C. Only annual audits.
• D. No formal process.

Answer: (A)

The key idea is that any change to safety-related software must go through a formal change control process that includes independent validation. Change control creates a structured path for proposing, reviewing, approving, implementing, and documenting changes. Adding independent validation means a separate, qualified party reviews the change—its requirements, design, implementation, and test results—to confirm the change fulfills its purpose without introducing new risks. This separation of duties provides objective assurance that safety requirements are met, interfaces remain correct, and the system behaves as intended, with traceable records showing what changed, why, who approved it, and how it was tested. That independent check is what ensures verification by a party not involved in the development, which is essential for safety-critical software. Loose governance would sacrifice rigor for speed, annual audits alone don’t provide timely verification or catch issues before deployment, and having no formal process leaves changes untracked and unverified.

The key idea is that any change to safety-related software must go through a formal change control process that includes independent validation. Change control creates a structured path for proposing, reviewing, approving, implementing, and documenting changes. Adding independent validation means a separate, qualified party reviews the change—its requirements, design, implementation, and test results—to confirm the change fulfills its purpose without introducing new risks. This separation of duties provides objective assurance that safety requirements are met, interfaces remain correct, and the system behaves as intended, with traceable records showing what changed, why, who approved it, and how it was tested. That independent check is what ensures verification by a party not involved in the development, which is essential for safety-critical software.

Loose governance would sacrifice rigor for speed, annual audits alone don’t provide timely verification or catch issues before deployment, and having no formal process leaves changes untracked and unverified.