Whatever verifications you choose, a detailed verification / action plan is required to outline who will be taking what actions by when. The action plan should show what data or statistics will be collected and analyzed, who is responsible and must track actual progress and scheduled completion. The action plan is the detailed Dynamic record of all phases of the problem solving process.
Good problem solution verifies the customer is satisfied with the solution. If possible, involve the customer in choosing solutions.
All verification of the problem solution will require decision analysis. Decision analysis is part of the cost and timing consideration of the solution. Decisions affecting cost must include effects on quality, future problem recurrence and complete elimination of the problem. In addition, management and operating procedures may be involved when choosing the solution. Evaluation of any adverse effects caused by the solution are important. The FMEA will most surely be affected.