During the preliminary takeoff performance computation, the flight crew takes advantage of a relatively low workload phase before takeoff to plan their actions thoroughly. Both pilots establish a shared understanding of the takeoff plan, ensuring they use consistent parameters for performance calculations, including any MEL/CDL restrictions and NOTAM information.

The crew then cross-checks the results to confirm the accuracy of the computations. They verify key values, such as the assigned runway, any runway shift, takeoff speeds, Green Dot Spee, TOGA/FLX power setting, flap configuration, use of packs and anti-ice systems, and the engine-out acceleration altitude. This ensures all essential elements are correctly set for a safe and efficient takeoff.