Using an analytic-synthetic model of ergonomic research of management information systems (MIS) in coal mines, we identified 13 elements which were used to define eight factors that impact operator's performance. These eight factors were further reduced to five key factors after the application of expert assessment. We have defined 23 indicators for these key factors, ranked by means of the analytic hierarchy process method. This paper includes a detailed ergonomic analysis of the five key operator quality indicators, namely, shape and size of the control panel, functionality of the video display terminal, keyboard functionality, alarm response time and expansion of the MIS with environmental parameters. Based on the condition prior to and after the proposed changes, we were able to use this approach to determine and discuss the operator quality index.Keywords: management information system; expert assessment; AHP method; operator quality index 1. Introduction The management information system (MIS) of an underground coal mine consists of the alarm and voice communication system, in addition to the configuration of the remote control system for ventilation, gas and fire parameters (concentration of methane, carbon monoxide, oxygen and smoke gases; speed and amount of air for circulating and separate ventilation; depression of the ventilation facility; temperature and air humidity, etc.), as well as data concerning excavating machinery, transport systems, extraction facilities, power supply and electricity distribution, mine drainage, etc. coupled with measuring devices and signal transmitters, devices for data collection and transfer, and devices for information displaying, printing and storing. This system is often adjusted for the specific nature of the underground mining technological process.Efficient control of the uneven and complex mining and production activities, followed by extensive data, is conducted by means of control and management centres (CMCs), which perform central monitoring and real-time decision-making and management, wherein the human operator is actively involved in the processes of notification, alert and management decision-making. In order to complete the MIS in underground coal mines, it is necessary to expand the system with information on the environmental impact of mining in the vicinity of the mine and to determine the qualitative and quantitative assessment of the impact. This is achievable by means of modern information