System for monitoring, operating and servicing an industrial plant, particularly of the metal-producing industry or the steel industry, comprising: at least one mobile terminal with at least one sensor for detection of measurement values within the industrial plant, at least one position sensor for detection of the position of the at least one mobile terminal in the industrial plant, a central data processing device for processing the measurement values, which are detected by the at least one mobile terminal by means of the at least one sensor, with consideration of the position, which is detected by means of the at least one position sensor, of the at least one mobile terminal in the industrial plant, and at least one communications network for exchange of data between the at least one mobile terminal, the at least one position sensor and/or the central data processing device, wherein the central data processing device is configured to create an activity plan for the user of the at least one mobile terminal and to communicate it to the at least one mobile terminal so as to provide the communicated activity plan to the user of the at least one mobile terminal, characterised in that the activity plan is based on the detected measurement values and imparts to the user instructions with respect to activities to be carried out in order to ensure or improve the operation of the industrial plant or to service the industrial plant and in that the at least one mobile terminal is configured to provide a communication between the industrial plant and/or machines, units, parts or other components of the industrial plant and the central data processing device, whereby the central data processing device can directly configure the industrial plant as a reaction to the detected measurement values. at least one mobile terminal with at least one sensor for detection of measurement values within the industrial plant, at least one position sensor for detection of the position of the at least one mobile terminal in the industrial plant, a central data processing device for processing the measurement values, which are detected by the at least one mobile terminal by means of the at least one sensor, with consideration of the position, which is detected by means of the at least one position sensor, of the at least one mobile terminal in the industrial plant, and at least one communications network for exchange of data between the at least one mobile terminal, the at least one position sensor and/or the central data processing device, wherein the central data processing device is configured to create an activity plan for the user of the at least one mobile terminal and to communicate it to the at least one mobile terminal so as to provide the communicated activity plan to the user of the at least one mobile terminal, characterised in that the activity plan is based on the detected measurement values and imparts to the user instructions with respect to activities to be carried out in order to ensure or improve the operation of the industrial plant or to service the industrial plant and in that the at least one mobile terminal is configured to provide a communication between the industrial plant and/or machines, units, parts or other components of the industrial plant and the central data processing device, whereby the central data processing device can directly configure the industrial plant as a reaction to the detected measurement values.