## 4 Results and Discussion
### Comparison
#### 4.6.3 Comparison of Work Productivity Achieved on Various Construction Sites  
Some of the most demanding construction activities in terms of importance and from the perspective of the number of deployed workers include masonry and plastering works. This is why their labor productivity at the construction sites is monitored on a long-term basis. * Plastering works  
Figure 18 illustrates a comparison of the labor productivity for the plastering works of constructions undertaken in the Czech and Slovak Republics in recent years. The highest labor productivity achieved at the Jegeho alej construction site in Bratislava (2009) was 12% lower compared to the values according to the database. As we can see in Figure 14, the performance values are even lower during the subsequent years. For the construction of the Prague-Prosek apartment complex, this number amounts to 13%, the project at Klementova Street in Prague (2013) recorded 16%, while the number for the projects in Vsetin was 31% and 29% in FNSP Ostrava (2021). * Masonry works  
Figure 19 illustrates a comparison of the sample averages, mean values of the labor productivity achieved at individual projects. The highest sample average was recorded at  
Figure 17: Duration of construction processes. Figure 18: Comparison of plastering works productivity. the Jgeho alej construction site in Bratislava. This value represents a labor productivity decrease of 7% in comparison with the value complying with the database. The construction of the Prague-Prosek apartment complex recorded a labor productivity decrease of 13%. This number for the Prague Klementova project was 15% and was 12% for the FNSP Ostrava. The biggest labor productivity decrease was recorded in Vsetin. It amounted to 19.4%. Conclusion: The assessment of the recorded performances of the construction processes at the monitored construction sites show labor productivity decreases during the last 10 years in comparison with the planned values complying with the database. As we can see in Figure 20, these decreases for plastering works reach higher values, up to 30%, while the decreases for masonry works amount to approximately 20%. The reason for the higher labor productivity decrease in the given process is represented by its higher labor intensity compared to that of bricked structures. The most common construction production management method which is currently being used is the monitoring of progress using construction software, such as Primavera or MS Project. The utilization of this management method does not allow for signaling abnormal deviances from the partial construction process deadlines in advance, which would allow for adopting personnel measures for ensuring compliance with the planned commencement of the subsequent process. The proposed construction process monitoring  
Figure 19: Comparison of masonry works productivity. Figure 20: Percentual fulfillment of the construction process. method corrects this main deficiency by utilizing a collection of the actually achieved performance data during the initial stage of the given construction process. The proposed method serves construction management who can immediately react to the given situation based on these recorded data by planning the work capacities. Accurate capacity planning aims to shorten the construction time, thus reducing the construction costs. Similar simulation models of the construction time course based on the collection of data on currently achieved performances are dealt with by a number of authors such as [PERSON] or [PERSON] et al. The prediction of the construction time course, as in the study, is based on the collection of data on achieved performances on the construction site. A performance database for the Curtain Wall Operation in High-Rise Building Construction was also created, which serves for the prediction of the construction time course of this type. The proposed simulation model (PSM) published by [PERSON] et al. overcomes traditional simulation technique limitations by focusing on curtain wall operations.