Method for controlling subsystems of an aircraft, each subsystem comprising at least one member to be chosen from a list comprising at least: an actuatable device which can change state on request, an actuator connected to at least one actuatable device for controlling the state of this actuatable device, a sensor measuring at least one parameter, an information interface signalling at least one item of information to a person, a control interface suitable for controlling at least one other member, characterised in that: - during a preparation step implemented on the ground or in flight prior to a control sequence, at least one global order is stored in a database, each global order including an eligibility condition specifying at least one condition to be implemented in order to be able to select said global order, at least one global order including at least one activation condition, each global order specifying a control sequence comprising at least two actions to be implemented either sequentially or in parallel by two different members, - during an initialisation step of a control sequence, an onboard computer determines whether a stored global order, referred to as "selected global order ", is selected automatically or by an act referred to as "pilot act" implemented by a person, - if said selected global order comprises at least one activation condition, during an activation step of the control sequence, an onboard computer determines the feasibility of said selected global order by verifying that the aircraft can implement said selected global order by determining whether each activation condition of said selected global order is satisfied, - during an implementation step of the control sequence, if said selected global order does not have an activation condition or if each activation condition of said selected global order is satisfied, said onboard computer implements said actions specified by said selected global order. - during a preparation step implemented on the ground or in flight prior to a control sequence, at least one global order is stored in a database, each global order including an eligibility condition specifying at least one condition to be implemented in order to be able to select said global order, at least one global order including at least one activation condition, each global order specifying a control sequence comprising at least two actions to be implemented either sequentially or in parallel by two different members, - during an initialisation step of a control sequence, an onboard computer determines whether a stored global order, referred to as "selected global order ", is selected automatically or by an act referred to as "pilot act" implemented by a person, - if said selected global order comprises at least one activation condition, during an activation step of the control sequence, an onboard computer determines the feasibility of said selected global order by verifying that the aircraft can implement said selected global order by determining whether each activation condition of said selected global order is satisfied, - during an implementation step of the control sequence, if said selected global order does not have an activation condition or if each activation condition of said selected global order is satisfied, said onboard computer implements said actions specified by said selected global order.