
In general, much work is concentrated in the latter half of the architectural process. However, if one attempts to introduce environment-friendly elements at this stage, it will cause cost increases because changes will become frequent. As a result, this will lead to time and monetary losses, which will make it difficult to achieve the initial goals.

It is necessary to adopt an integrated project delivery (IPD) process to solve this problem in the architecture process and successfully construct a green building. When experts of each field have strategic discussions right from the initial stage by segmenting the architectural process, the initial investment cost will relatively increase, but since the strategy for each field is discussed from the beginning, there will be less concern that it will re-discussed at a later stage or that a new element will suddenly be adopted.

Of course, studies on integrated processes have not been completely non-existent so far. Abroad, integrated design processes, such as iiSBE, AIA, and Metro Vancouver, for solving the above-mentioned problems have been researched and applied practically.

However, because these processes were created on the basis of overseas architecture processes, there are problems in applying them immediately in South Korea. Furthermore, the aforementioned examples are mostly text-oriented and the whole process is difficult to visualize at one glance; thus, workers cannot easily understand which task has to be performed when. Therefore, construction of an integrated process suitable for the South Korean architectural situation is essential for successfully constructing an environment-friendly building. Moreover, the existing integrated processes have common limitations in not being actively applied in the architecture market, and the limitations can be understood by analyzing three representative cases, <AIA (Institute of Architects Integrated Project Delivery: A Guide), WSIP (Whole System Integration Process), and iiSBE The Integrated Design Process.> In these cases, a process to be implemented after the completion of buildings are absent; criteria for decision making are absent and judgment criteria are ambiguous; and collaboration relationships between participants are unclear. Furthermore, the work flows are unclear and the contents to be produced at each stage are uncertain. Based on these limitations, the research team summarized environment-friendly architectural elements by reflecting expert opinions from relevant fields to construct a process suitable for the South Korean building market, and developed an advanced IPD process that considers the current situation in South Korea. To supplement the limitations of existing integrated processes, it consists of a four layer model, based on which, a new integrated process was constructed. To supplement the absence of processes to be implemented after completion of buildings in the existing processes, it was necessary to develop an integrated process that included the entire lifecycle. First, to supplement the contents of each stage and the work flows, which are not clearly provided in the existing integrated process models, the Abstract Layer, which can show the progress of the entire process was developed. Second, to clearly provide a decision making criteria for participating experts in the process of carrying out a project, the Contents Layer, which can specify issues to be dealt with at each stage and lead the decision making in the optimal direction, was developed. Third, the Role Players Layer was developed, which clearly specifies the project participating period for the participating experts, tasks to be performed at each stage of the process, and a workshop meeting time for decision making. Finally, the fourth Sample Case Layer was completed with a layer model applied to the Test-bed (POSCO Green Building). Based on the implemented IPD, if outputs can be produced according to specific goals through coordination of workers, effective working level changes can be implemented.