A vacuum suspension system comprising: a prosthetic socket adapted for receiving a residual limb; a pump system including a pump mechanism in fluid communication with the prosthetic socket; a plurality of sensors (16, 27) associated with at least one of the prosthetic socket and the pump mechanism; a control system operably connected to the pump mechanism and the plurality of sensors (16, 27), the control system arranged to receive and process data from the plurality of sensors (16, 27) and to actuate the pump mechanism based on the received data from the plurality of sensors (16, 27); a regulating module arranged to receive information from the plurality of sensors (16, 27); and at least one valve assembly in fluid communication with the pump system, the at least one valve assembly being controllable by the control system and adjusted according to direction from the regulating module; characterized in that the plurality of sensors (16,27) is arranged to measure at least volume fluctuation of the residual limb, pressure changes inside the prosthetic socket, and relative movement between the residual limb and the prosthetic socket; the data from the plurality of sensors is representative of the pressure changes inside the prosthetic socket, the relative movement between the residual limb and the prosthetic socket, and the volume fluctuation of the residual limb over a period of time; and the control system is arranged to generate vacuum performance information representative of an effectiveness of the pump mechanism by comparing the pressure change inside the prosthetic socket and relative movement between the residual limb and the prosthetic socket when the volume of the residual limb fluctuates. a prosthetic socket adapted for receiving a residual limb; a pump system including a pump mechanism in fluid communication with the prosthetic socket; a plurality of sensors (16, 27) associated with at least one of the prosthetic socket and the pump mechanism; a control system operably connected to the pump mechanism and the plurality of sensors (16, 27), the control system arranged to receive and process data from the plurality of sensors (16, 27) and to actuate the pump mechanism based on the received data from the plurality of sensors (16, 27); a regulating module arranged to receive information from the plurality of sensors (16, 27); and at least one valve assembly in fluid communication with the pump system, the at least one valve assembly being controllable by the control system and adjusted according to direction from the regulating module; characterized in that the plurality of sensors (16,27) is arranged to measure at least volume fluctuation of the residual limb, pressure changes inside the prosthetic socket, and relative movement between the residual limb and the prosthetic socket; the data from the plurality of sensors is representative of the pressure changes inside the prosthetic socket, the relative movement between the residual limb and the prosthetic socket, and the volume fluctuation of the residual limb over a period of time; and the control system is arranged to generate vacuum performance information representative of an effectiveness of the pump mechanism by comparing the pressure change inside the prosthetic socket and relative movement between the residual limb and the prosthetic socket when the volume of the residual limb fluctuates.