You are the lead engineer for a rapid acquisition program based on the militarization of a commercial, racing model dune buggy. Early vehicles experience problems with welded joints cracking on the frame due to the rugged operational conditions. Additional material was added to eight location on the frame. Additional inspections and testing are required. The results of these studies will influence producibility and will allow collection of product data essential for manufacture of subsystem prototypes. What manufacturing readiness level should you use to assess this scenario