The remediation plan should be evaluated at what point in the change lifecycle?

ITIL change management requires that a remediation plan - the documented procedure for restoring the previous state if the change fails - be reviewed and accepted as part of the change authorization process. Evaluating it before approval ensures decision-makers can confirm the change is reversible, making the approval fully informed and the implementation safe.

Evaluating the plan only after the change has already failed means no pre-approved backout procedure was in place at implementation time, violating the requirement to plan for failure in advance.

After implementation is too late - the remediation plan must be ready and validated before the change begins, not after the change window has already been used.

Waiting until a post-implementation review identifies a problem means the organization executed the change with no pre-planned recovery strategy, which is a fundamental governance failure.