A method for performing a tool change on a processing plant with at least one first working spindle ; a tool magazine for storing different processing tools , wherein at least one storage plane having several tool receiving spaces arranged next to one another is provided in the tool magazine ; a tool change device comprising at least one first gripper device for exchanging the processing tool held in the working spindle , wherein the gripper device comprises at least one first gripper unit and one second gripper unit which are positioned at a gripper-unit distance from one another, wherein the method comprises the following method steps: - removing a processing tool that has already been used from the working spindle by means of the first gripper unit ; - inserting a processing tool held in the second gripper unit into the working spindle ; - moving the gripper device to the tool magazine for receiving a new processing tool from the tool magazine into the gripper device and simultaneously placing the already used processing tool from the gripper device into the tool magazine ; and simultaneously - processing a workpiece by means of the processing tool held in the working spindle , characterized in that a second working spindle is arranged next to the first working spindle , wherein the working spindles are arranged in parallel to one another and serve for receiving one processing tool each and that the tool change device comprises a second gripper device , wherein the two gripper devices are moved synchronously to one another and simultaneously operate the two working spindles . at least one first working spindle ; a tool magazine for storing different processing tools , wherein at least one storage plane having several tool receiving spaces arranged next to one another is provided in the tool magazine ; a tool change device comprising at least one first gripper device for exchanging the processing tool held in the working spindle , wherein the gripper device comprises at least one first gripper unit and one second gripper unit which are positioned at a gripper-unit distance from one another, wherein the method comprises the following method steps: - removing a processing tool that has already been used from the working spindle by means of the first gripper unit ; - inserting a processing tool held in the second gripper unit into the working spindle ; - moving the gripper device to the tool magazine for receiving a new processing tool from the tool magazine into the gripper device and simultaneously placing the already used processing tool from the gripper device into the tool magazine ; and simultaneously - processing a workpiece by means of the processing tool held in the working spindle , - removing a processing tool that has already been used from the working spindle by means of the first gripper unit ; - inserting a processing tool held in the second gripper unit into the working spindle ; - moving the gripper device to the tool magazine for receiving a new processing tool from the tool magazine into the gripper device and simultaneously placing the already used processing tool from the gripper device into the tool magazine ; and simultaneously - processing a workpiece by means of the processing tool held in the working spindle , characterized in that a second working spindle is arranged next to the first working spindle , wherein the working spindles are arranged in parallel to one another and serve for receiving one processing tool each and that the tool change device comprises a second gripper device , wherein the two gripper devices are moved synchronously to one another and simultaneously operate the two working spindles . <EOS>