# Concept of Virtual Reality Training of Facility Management Employees Using Eye Tracking
## 1 Introduction  
Facility management (FM) employees must have high technical skills and detailed knowledge of the technology of all systems necessary for the efficient and safe operation of buildings. Constant supervision of the efficiency of fire protection, ventilation, energy, and many other systems, as well as monitoring, alterations, and modernization of installations, is crucial in ensuring the safety of all users. Therefore, improving and verifying the staff's current skills are essential. For this purpose, it is necessary to develop a system of training and assessment of skills acquired by the staff. High safety conditions, low costs, and high efficiency should characterize applied training systems. Traditional facility management training is often not easy to carry out due to the following limitations [1]:Time consumption related to the need to prepare the place of training and accommodation;  
High price due to the costs of preparing materials and coaching staff;  
Low attractiveness and non-intuitiveness due to the lack of visual hints available during the training;  
Inability to test some events, e.g., those related to human safety. Therefore, organizing staff training in virtual reality (VR) seems interesting. There are many areas in which employees are trained using virtual reality: first responder training [2; 3; 4], medical training [5; 6; 7], military training [8; 9], and transportation [10; 11]. Another area of using VR in workforce training applies to many industries and various purposes. The VR simulator of work at high altitudes has been used to train people [12]. It also allows us to determine how future workers can manage their stress and detect symptoms of acrophobia. High-risk and high-stress jobs are often the focus of VR training, such as maintenance concentrated on the reliability of power grids [13] or construction workers operating machinery on construction sites [14]. VR training can reduce accidents and fatalities in high-risk work [15; 16]. It is also important that VR training allows employees to train in dangerous situations without exposing themselves to real danger. Nevertheless, the main reason for using the VR environment compared to traditional training is the low cost and repeatability while maintaining resistance to environmental errors without threat to personal safety [17]. Properly conducted training of employees in virtual reality allows for the reconstruction of identical test conditions for all participants, thanks to which high comparability of training results is achieved. The expert group method can also use the virtual environment for ergonomic workplace design [18]. Training in virtual reality allows for a deeper analysis of the training results. In traditional training, an in-depth analysis of each participant, including a detailed analysis of the movement, the subtleties of the technique used, and focusing attention on individual elements of the equipment, is impossible. However, virtual training allows for an in-depth analysis of each participant's results, and we can carefully analyze their movement, how they perform a task, and even their attention to critical elements. The correct design of the VR environment must consider many aspects. In the cognitive theory of learning through multimedia (CTML), we should avoid rich and highly stimulating multimedia graphics that overload cognitive processes and, therefore, can hinder the learning process [19]. The training participant should pay attention to the essential part of the learning material, the information in the VR environment should be consistent, and all the information parts should be close together [20]. Learners should be given time to mentally understand multimedia instruction, especially when the content is complex [20]. To perform an in-depth analysis, we should use eye-tracking during training, providing us with additional essential data [21]. VR training with eye tracking allows understanding of what the user focuses on during training in the decision-making process and when this takes place.