## 2 BIM and DT Idea and Applications
The second digital product twins facilitate product design and testing by digitally mapping them. Finally, the digital process twins facilitate the identification of areas for improvement both considering real data and predictions based on historical data. * A cyberdata processing system combines a physical object with its digital model. This system is responsible, among other things, for collecting and storing sensor data, processing it, and updating the digital model in real time. The data processing system may also include ML algorithms that allow the prediction of physical object behavior and the identification of potential problems, diagnostics, and inspection planning [45]. The aforementioned elements render the DT approach particularly useful in supporting building and infrastructure management procedures during the building's operation period, complementing the solutions and possibilities offered by BIM [46]. It is of particular importance to note that DT solutions utilize real data from the serviced facility, which predisposes them to cooperate with extensive modules of modern BACS and smart home systems and also from the perspective of integrating IoT solutions. A further advantage of both BIM and DT approaches is the availability and functional capabilities of utility tools and software packages supporting the organization and operation of BIM and DT tools. The availability of this type of tool package is significant, but in practice, in relation to the building industry, it focuses on several solutions. CarnotUIBK version 2.1 is MATLAB's version R2024a new tool for dynamic building simulations that can be used for DTs. It consists of two parts: an object-oriented data management framework and a simulation framework in Simulink version R2024a. It allows one to easily import data from various formats, including gbXML version 7.0 (BIM), Excel version Microsoft 365, and PHPP version 7.0. Moreover, this tool provides efficient simulation and result analysis, very important in verification procedures of various operating and control scenarios of building installations. It is adapted for \"hardware-in-the-loop\" applications, development of controllers, and internal air quality simulation. It is a valuable tool for civil engineers, HVAC system designers, and researchers [47]. Revit is a widely used BIM design software program for construction. According to [48], there is a clear need for training programs for technicians and engineers on the use of Revit in architectural design (Revit Architecture), installations (Revit MEP), and costing (Revit Costing). The research and training programs currently available at universities are inadequate. The implementation of training programs for midlevel staff can facilitate the utilization of BIM technology in construction. In [49], the building management problem was solved via cloud service Autodesk BIM 360 Ops. This service enables the manager to add asset data from various sources such as Revit, BIM 360 Field, IoT, and spreadsheets. This facilitates review documents and models, maintenance checklists, schedules, and history. This approach enables maintenance workers to manage assets and perform maintenance tasks. As indicated in [50], the Ansys Twin Builder software version 2024 R1 facilitates integration with SCADE Display visualization software version 2024 R1. This functionality enables Ansys users to observe movements, deformations, and other parameters of a simulated object in a 3D environment in real time. This program allows one to visualize complex simulations covering many areas of physics (e.g., mechanics, heat flows, fluid flows) and various engineering disciplines (e.g., mechanics, electronics, control). This approach enables engineers to have a holistic view of the simulation and identify the relationships between the various elements. When selecting software for the creation or operation of a DT, it is essential to consider the user's specific, current needs and anticipate future needs.