## 6 Conclusions  
In Korea, from 2012, the application of BIM to public construction projects worth more than USD 40 million has been mandated. Other national policy changes--i.e., ASIPA and NCS--have led BIM to be a \"must\" in the construction industry. In parallel with these trends, the role of POs has been significantly stressed. POs have been expected to be a central BIM player from the planning stage of the construction projects onwards. When procuring BIM service, the POs refer to diverse domestic or international BIM guides. Many POs, however, have insisted that the existing guides involve deficiencies in meeting their needs for procuring BIM services; they have emphasized that it is necessary to develop a more PO-oriented BIM guide that considers the public business procedures, addresses the ways to meet the requirements of the policy changes, and is usable as a one-stop reference to develop appropriate guidelines for the POs' specific BIM service contracts. The main objectives of this study were to investigate the ideal nature of an owner-oriented BIM guide, suggest the BIM service Scoping, Tendering, Executing, and Wrapping-up (STEW) process as the structure of the guide, and identify the major contents to be included in the guide. To meet the research objectives, the authors implemented three activities: reviewing the existing body of knowledge on diverse BIM guides, identifying POs' opinions on the guides, and developing the STEW guide. More than 20 domestic and international BIM guides were analyzed in order to identify the contents that were valuable and suitable to the research objectives. Workshops with an FGI format were conducted twice to identify the STEW structure. Twelve workshop subjects were invited from public institutions, international BIM design firms, and public research institutions: eight from central and local public institutions, two from international BIM design firms, and two from the government-funded research institutes--KICT and KEDI. Since the two subjects from the BIM design firms had worked for the DDP project with the POs in the SMM, they were expected to comprehend what the POs were primarily concerned with in BIM applications. The two subjects from the KICT and KEDI had developed national BIM policies and guidelines with high-level POs, so they were assumed to recognize the essentials regarding the POs' attitudes toward BIM services. In the first workshop, the subjects defined a desirable BIM guide that could satisfy POs' needs. This was defined as a guide whose structure follows the public procurement process in conjunction with various project delivery methods, and whose contents deliver very comprehensive step-by-step BIM instructions, so that it is usable as a one-stop reference to develop suitable guidelines for BIM service contracts. The 'one-stop' status indicates that the reference deals so comprehensively with BIM service procurement that the POsneed not browse a variety of guides exhaustively in order to find out what they want. The authors reviewed 4 domestic and 7 international BIM guides to figure out how well they would fit the desirable BIM guide, and asked the subjects to determine whether there was a guide among the 11 that could be used as the one-stop reference; the respondents concluded that although a few of the guides were relatively more comprehensive than the others, none could be usable as the one-stop reference. The second workshop was conducted to organize the STEW guide as the structure of the desirable BIM guide. In so doing, the subjects identified 10 activities that the POs necessarily performed in procuring BIM services while meeting the requirements of governmental policies. The 10 activities were then divided into 4 sequential stages, which included a BIM service Scoping Stage (BSS), a BIM service Tandering Stage (BTS), a BIM service Executing Stage (BES), and a BIM service Wrapping-up Stage (BWS).