The date the project will complete. Until this date, the product is produced with the original specifications. After this date, the product is produced with the new specifications. Any existing inventory at that time is reworked to the new specifications at no additional cost.
Tip: Under the rules, a new project cannot begin until the old project finishes. All projects begin on January 1st. Projects that finish in December are better than projects that finish in January because the December revision date will allow you to begin a new project almost immediately, while the January revision date will force you to wait until the next round. Products with incomplete R&D projects appear yellow in the spreadsheet, and they are protected from change.