An apparatus for assisting with functional testing of systems of an aircraft, the apparatus comprising: a display device; one or more data processors operatively coupled to the display device; and non-transitory machine-readable memory operatively coupled to the one or more data processors, storing instructions executable by the one or more data processors and configured to cause the one or more data processors to: generate an output for causing the display device to display a plurality of test objects respectively associated with a plurality of functional tests of respective systems of the aircraft; using data indicative of a condition of the aircraft, select one or more selected functional tests from the plurality of functional tests based on the condition of the aircraft; and generate an output for causing the display device to identify one or more identified test objects from the plurality of test objects, the one or more identified test objects being respectively associated with the one or more selected functional tests; characterized in that the data indicative of the condition of the aircraft is indicative of at least one of: whether a next flight of the aircraft is a first flight of a day; whether the next flight of the aircraft immediately follows a change in flight crew, and whether the next flight of the aircraft immediately follows a cold and dark start of the aircraft. a display device; one or more data processors operatively coupled to the display device; and non-transitory machine-readable memory operatively coupled to the one or more data processors, storing instructions executable by the one or more data processors and configured to cause the one or more data processors to: generate an output for causing the display device to display a plurality of test objects respectively associated with a plurality of functional tests of respective systems of the aircraft; using data indicative of a condition of the aircraft, select one or more selected functional tests from the plurality of functional tests based on the condition of the aircraft; and generate an output for causing the display device to identify one or more identified test objects from the plurality of test objects, the one or more identified test objects being respectively associated with the one or more selected functional tests; characterized in that the data indicative of the condition of the aircraft is indicative of at least one of: whether a next flight of the aircraft is a first flight of a day; whether the next flight of the aircraft immediately follows a change in flight crew, and whether the next flight of the aircraft immediately follows a cold and dark start of the aircraft. generate an output for causing the display device to display a plurality of test objects respectively associated with a plurality of functional tests of respective systems of the aircraft; using data indicative of a condition of the aircraft, select one or more selected functional tests from the plurality of functional tests based on the condition of the aircraft; and generate an output for causing the display device to identify one or more identified test objects from the plurality of test objects, the one or more identified test objects being respectively associated with the one or more selected functional tests; characterized in that the data indicative of the condition of the aircraft is indicative of at least one of: whether a next flight of the aircraft is a first flight of a day; whether the next flight of the aircraft immediately follows a change in flight crew, and whether the next flight of the aircraft immediately follows a cold and dark start of the aircraft.