## 5 Conclusions  
In this research, a hybrid approach was applied. A methodological procedure was proposed that enabled the selection and ranking of indicators to improve the existing OHS system, based on a defined set of hierarchically organised indicators. This was applied with the aim of selecting indicators that could help improve the OHS system in small window- and door-fitting companies. First, from the thirty-nine offered indicators, the experts selected twenty key indicators, five for each of the four factors. Weighted Borda voting was used for the selection of KIs, with the experts' weights determined based on their experience. Second, a group FAHP method was applied to rank the KIs. This procedure is convenient due to the hierarchical structure of the problem and the need to account for uncertainty in the decision-making process. However, in FAHP, only the membership function (\(\mu\)) is used during the analysis. Hesitation could further enhance the realism of decision making.  
Among the indicators, the experts highlighted the efficiency of OHS resource management, the frequency of coordinating activities with contractors, the communication capacity of workers, the analysis of the results of external OHS controls, the number of external funds for OHS system improvements, and the number and assessment of incidents. These results are a consequence of the current state of the analysed OHS systems and the consideration of their potential for the most effective improvements.  
Furthermore, ten scenarios were analysed with varying values of factor weights. The scenarios showed the importance of highlighted indicators, which were always ranked among the top ten indicators.  
The list of indicators was not created for a specific activity but is of a universal nature. The presented list of indicators is not exhaustive and can be supplemented with new indicators. By adding indicators, the same hierarchical structure can be applied to other companies with specific operational activities. Thus, this structure could be tested in different industrial settings, while emerging technologies could also be included in the analysis to examine their influence on workplace safety practices. After adding new indicators, the procedure for selecting and ranking KIs must be repeated. Window- and door-fitting activities should also be considered from the perspective of potential long-term consequences such as issues caused by the physical and mental workload of employees due to increased dynamics and the volume of work. The creation of funds to help small businesses improve OHS systems as well as the formation of knowledge communities or communities of practice to share OHS experiences could further enhance the working conditions. Further activities will focus on initiating the development of such a fund as well as supporting the creation of a community of practice or knowledge community for networking small window- and door-fitting companies to promote interorganisational OHS knowledge exchange and spillover.  
This research received no external funding.  
Not applicable.  
**Data Availability Statement:** Data is contained within the article. Further inquiries can be directed to the corresponding author.  
The author wishes to thank the Ministry of Science, Technological Development, and Innovation of the Republic of Serbia for their kind support (contract no. 451-03-137/2025-03/200148).  
The author declares no conflicts of interest.