Joshua is a project manager at an information technology company. The company receives a project that has to be completed in a short period of time. Joshua decides to increase the delivery team's daily working hours to speed up the project. However, Martha, the delivery team leader, does not want her team to be pressured and insists that Joshua ask the client for a deadline extension. Joshua wants to please the customer, so he is against Martha's suggestion. Which of the following is an effective strategy for resolving your differences without compromising each other's position?