# An Expert Knowledge-Based System to Evaluate the Efficiency of Dry Construction Methods
## 4 Discussion and Conclusions  
Due to the current large number of construction systems and techniques that the market offers for various phases of the construction of residential buildings, from the foundation, through the skeleton construction, to the finishing works, investors can decide on the basis of various criteria which construction systems and techniques they will lean towards. Some still prefer traditional construction methods, in other words \"wet construction\", others choose \"dry construction\" techniques or the possibility of combining wet and dry construction systems and techniques. The construction industry is moving towards efficient processes in terms of costs and time; therefore, when designing and assessing the project, clients emphasize the amount of necessary funds and the time or date when they will be able to use the building or hand it over for use. Existing research suggests that knowledge systems will become one of the important means of knowledge management in the future. Knowledge graph application is research focused on specific problems using multiple technologies [40; 41]. Our research can also be included among such technologies. Due to the decentralization and complexity of knowledge in architecture, engineering, and construction, research on knowledge graphs is still insufficient [42]. In our research, emphasis is placed on the correct analysis and consequential selection of suitable materials according to the requirements for the construction of final building  
Figure 11: Graphical interpretation of the evaluation of the advantages of combinations of dry and wet construction systems and techniques of finishing works for RD 70.  
structures, similar to what has been conducted in other research studies [43; 44]. When considering the construction of dry gypsum-based linings, it is possible to state that these are recognized as ecological and efficient materials suitable for modern construction. The mechanical properties of gypsum-based composites are decisive for determining their suitability for various applications, which also applies to the application of dry linings [45]. When choosing a system or technique for finishing processes, the costs and construction time are decisive [46; 47]. The study presented offers an exploration of these connections through a knowledge system designed and developed by us. Its knowledge base includes a knowledge-based arrangement of time and cost parameters of 798 selected traditional wet systems and techniques and 620 modern dry systems and techniques to construct partitions, wall finishes, ceilings, and floors. The inference engine of the knowledge system--the complex COMBINATOR--allows the effects of using different types and combinations of DCSTs within the finishing works to be simulated. The tool evaluates the combinations in terms of time and cost parameters (construction time, labor intensity in norm hours, the length of technological breaks, and construction cost) and the weight of the partitions, ceilings, floors, and wall finishes. Simulation modeling has been one of the most well-known decision support strategies for many years. [48; 49]. Our research is beneficial due to its most significant outputs:  
* A complete set of dry and wet construction systems and techniques for finishing works (partitions, ceilings, wall finishes, and floors) was developed. The knowledge base prepared by us includes characteristics and information on structural, cost, and time parameters, which can help clients in making decisions and choosing a system and technique, designers in the processing and design of project documentation, and contractors in the implementation of finishing processes. * The inference engine of the knowledge system allows different combinations of dry and wet systems and techniques for finishing processes to be simulated and thus examine the effects in the area of cost and time parameters.