Play the planner
You run the plant. Each turn you decide how many cases a week to plan for; hiring follows your plan, and batches still wait in QA before they can be sold. You see what a real planner sees: the orders coming in, your stock, what is in QA hold and your workforce. You never see the demand to come. At the end, your two years are compared with the planning rule on the very same demand.
Orders received and production
Your stock
Service
Your result
Market demand (now revealed), your production and the rule's