## 3 Results Analysis
### Dismantling and Recycling Stage
#### 3.10.1 Specific Analysis of the Dismantling and Recycling Stage  
Carbon and energy, resource efficiency, recycling, construction waste, and waste management of materials such as piping used in MEP construction [121] are hot topics of current research [120]. Moreover, from a life cycle perspective, the construction industry is responsible for consuming large amounts of natural resources and producing landfill waste globally [122]. The current assembled construction waste is disposed of in landfills [123]. In terms of recycling, there is an urgent need in the new era to accelerate the research and development of building demolition planning methods to utilize the residual utility and value of today's colossal building stock [124]. The MEP project includes more than ten subsystems, such as HVAC, automatic control, and water supply and drainage. Each system is a complex combination of multiple components, such as equipment, piping, and wiring [106], so research on dismantling and reuse is necessary. Reusing assembled building components has been identified as a method to maximize the utility and value of the product [125]. Therefore, it must be emphasized in the dismantling and recycling stages. However, problems are encountered in dismantling and utilizing recycling, such as detachability, recyclability, and deconstruction methods. In this regard, it was summarized by reading the literature that the LeanDfD method and software tools can be used to quantitatively assess the disassembablability and recyclability of electromechanical products [126]. [PERSON] and [PERSON] discussed and summarized the recyclability of various end-of-life electrical and electronic equipment types, including individual components and complete products [127]. However, the recovery of end-of-life products from extensive existing building inventories is hampered by the lack of integration of deconstruction methods, recycling, and demolition [128]. For this reason, selective demolition planning has been identified as a promising alternative to effectively address the recovery of end-of-life products from buildings [129]. Selective demolition planning, the sequence of steps to remove a targetbuilding component, is critical to the building component reuse process [130]. Research has focused on the technical assessment of the deconstructability of assembled structures to improve reuse [131]. However, current information models do not contain the necessary information to support deconstruction planning activities such as selective demolition [132]. Therefore, a classification of the information required for demolition modeling was developed [133], and BIM technology has become a critical system to support the construction and deconstruction planning processes [134] This technology enables accurate information with a powerful graphical interface. Although BIM has proven to be an effective tool for managing construction projects [133], current information models must support essential project activities. The main reasons for this are the need for more appropriate levels of detail in parametric disassembly models that define the correct physical interfaces between building components [130] and efficient methods for automatically determining the appropriate disassembly parameters from high-quality information models [135]. The main current difficulty lies in acquiring the parameters underlying the creation of accurate disassembly models [136], which remain elusive [137]. In this regard, the visual programming language of BIM can be an effective method for developing customized software solutions for the construction industry [129]. Further, an academic developed a first-of-its-kind BIM-based sequential building demolition planning method for selective demolition of buildings in 2018 [138]. This method was extended to multi-objective selective demolition planning in a subsequent study. A new building selective deconstruction planning method [139] was developed by improving their method by adding deconstruction methods for each building component [135].