A method for operating a turbine (112, 912) comprising: receiving, at a ratio controller, one or more turbine response values based on: a first process output value S out of a first actuator controller, the first process output value is based on a first process input value S in and at least one first control parameter selected from a group comprising a proportional gain value, an integral gain value, and a derivative gain value, wherein the first actuator controller comprises a first parameter controller; and a second process output value P out of a second actuator controller, the second process output value is based on a second process input value Pin and at least one second control parameter selected from the group, wherein the second actuator controller comprises a second parameter controller; providing, by the ratio controller and to the first actuator controller, the first process input value as a predetermined first constant set point value; varying, by the ratio controller and for the second actuator controller, the second process input value to a plurality of predetermined first set point values; receiving, by the second parameter controller and for one or more of the first set point values, one or more first updated turbine response values as the turbine response values; determining, by the second parameter controller, at least one third control parameter selected from the group based on the turbine response values; and providing, by the second parameter controller and to the second actuator controller, the third control parameter as the second control parameter; providing, by the ratio controller and to the second actuator controller, the second process input value as a predetermined second constant set point value; varying, by the ratio controller and to the first actuator controller, the first process input value to a plurality of predetermined second set point values; receiving, by the first parameter controller and for one or more of the second set point values, one or more second updated turbine response values as the turbine response values; determining, by the first parameter controller, at least one fourth control parameter selected from the group based on the turbine response values; and providing, by the first parameter controller and to the first actuator controller, the fourth control parameter as the first control parameter. receiving, at a ratio controller, one or more turbine response values based on: a first process output value S out of a first actuator controller, the first process output value is based on a first process input value S in and at least one first control parameter selected from a group comprising a proportional gain value, an integral gain value, and a derivative gain value, wherein the first actuator controller comprises a first parameter controller; and a second process output value P out of a second actuator controller, the second process output value is based on a second process input value Pin and at least one second control parameter selected from the group, wherein the second actuator controller comprises a second parameter controller; a first process output value S out of a first actuator controller, the first process output value is based on a first process input value S in and at least one first control parameter selected from a group comprising a proportional gain value, an integral gain value, and a derivative gain value, wherein the first actuator controller comprises a first parameter controller; and a second process output value P out of a second actuator controller, the second process output value is based on a second process input value Pin and at least one second control parameter selected from the group, wherein the second actuator controller comprises a second parameter controller; providing, by the ratio controller and to the first actuator controller, the first process input value as a predetermined first constant set point value; varying, by the ratio controller and for the second actuator controller, the second process input value to a plurality of predetermined first set point values; receiving, by the second parameter controller and for one or more of the first set point values, one or more first updated turbine response values as the turbine response values; determining, by the second parameter controller, at least one third control parameter selected from the group based on the turbine response values; and providing, by the second parameter controller and to the second actuator controller, the third control parameter as the second control parameter; providing, by the ratio controller and to the second actuator controller, the second process input value as a predetermined second constant set point value; varying, by the ratio controller and to the first actuator controller, the first process input value to a plurality of predetermined second set point values; receiving, by the first parameter controller and for one or more of the second set point values, one or more second updated turbine response values as the turbine response values; determining, by the first parameter controller, at least one fourth control parameter selected from the group based on the turbine response values; and providing, by the first parameter controller and to the first actuator controller, the fourth control parameter as the first control parameter.