Fuel planning ensures sufficient usable fuel for each flight with allowance for deviations, based on the specified data and conditions (aircraft-specific consumption, forecast weather, routings, ATC delays, contingencies, aircraft weight and MEL items); taxi fuel reflects local conditions and APU use; trip fuel covers takeoff to landing at destination; contingency fuel compensates for unforeseen factors under the defined methods; destination alternate fuel covers a missed approach and flight to the alternate, or to the second alternate where two are required; supplemental fuel is carried where no alternate is required; isolated airport fuel meets the defined minimum; final reserve fuel is at least 30 minutes' holding at 1,500 feet above the destination alternate (or destination if none) at holding speed; additional fuel covers engine failure and depressurisation to an alternate where the sum would otherwise be insufficient; discretionary fuel is at the PIC's or PIC and FOO's discretion; and fuel state awareness guidance is recommended (DSP 4.3.1 to 4.3.16).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.