Your major Subcontractor, providing a crucial part to your contract, recently disclosed that unexpected obsolescence of a critical part will increase the cost of their original estimates, from over extended quotes, by an estimated 40 percent and add an additional 7 months to the planned delivery schedule. No other vendors are available to meet the critical part requirement at this time. What style of negotiation would you use to get this contract with unexpected obsolescence back on track knowing these critical part will increase the cost of their original estimate? Within the this negotiation style, what key principles will you employ to help support the subcontract negotiation objective?