Disclosed is a method for controlling a computer-assisted arithmetic process in a technical system, which is designed for interactive network-based use such that data is input by means of an interactive network-based operation. Said data is processed at least in part during the computer-assisted arithmetic process while the interactive operations is prevented from actively influencing the computer-assisted arithmetic process and vice versa by dissociating the interactive network-based operation and the computer-assisted arithmetic process. Also disclosed is a device for controlling a computer-aided arithmetic process in a technical system, which is designed for interactive network-based use. Said device comprises a client, a server, a data memory, as controller, and an application. The client is connected to the server to exchange data, the server is connected to the data memory to exchange data, the data memory is connected to the controller to exchange data, and the controller is connected to the application to exchange data.