Final answer:
When faced with incomplete or lost production data during a consulting engagement to improve efficiency, the CAE should modify the scope of the engagement to focus on the available data.
Step-by-step explanation:
When faced with a scope limitation due to incomplete or lost production data during a consulting engagement to improve efficiency of a production process, the Chief Audit Executive (CAE) should consider modifying the scope of the engagement to focus on the available data.
This allows the audit team to proceed with their analysis without delaying the engagement or canceling it entirely. By narrowing down the scope, the team can still identify areas of improvement and provide valuable recommendations based on the available data.