Abstract:Abstract. The Delphi method has been used as a main research method by a growing number of researchers in the Construction Engineering and Management (CEM) field in the past two decades. Although a number of studies are available on the use of Delphi, few researchers fully examine the potential of the Delphi method in the combined use of statistical techniques, which is an inevitable trend for future Delphi research. This paper aims to review the combined use of Delphi and other quantitative methods in the CEM… Show more
“…To look into possible differences in RC values between green and traditional residential building construction projects, the Wilcoxon signed-rank test was conducted. This method is a non-parametric statistical test to compare two sets of scores that come from the same participants, without requiring the data must be normally distributed [51]. In this study, test results showed that the p-values of 35 risks were less than 0.05, suggesting there were significant differences in RC values of the most risks between green and traditional residential building construction projects.…”
Section: Risk Criticalities: Green Versus Traditional Residential Buimentioning
Abstract:Recently, an increasing number of green residential buildings have been developed worldwide owing to active promotion from the authorities and increasing interest from customers. However, in the same way as traditional residential buildings, the construction of green residential buildings faces various risks. The aims of this study are to identify and assess the diverse risks in green residential building construction projects, compare their risk criticalities with those in traditional counterparts, and propose helpful risk mitigation measures. To achieve these goals, a comprehensive literature review was first conducted, and a questionnaire was then administered to 30 construction companies in Singapore. Survey results showed that "complex procedures to obtain approvals", "overlooked high initial cost", "unclear requirements of owners", "employment constraint", and "lack of availability of green materials and equipment" were the top five critical risks in green residential building construction projects. Survey results also showed that green residential building projects were facing risks at a more critical level than those traditional residential building projects. Additionally, this study proposed fourteen risk mitigation measures to tackle the risks in green residential building construction projects. This study has contributed to the body of knowledge by identifying and evaluating the critical risks and mitigation measures in green residential building construction projects. Meanwhile, the findings from this study can also provide an in-depth understanding of risk management in green residential building construction projects to practitioners and thus benefit the practice.
“…To look into possible differences in RC values between green and traditional residential building construction projects, the Wilcoxon signed-rank test was conducted. This method is a non-parametric statistical test to compare two sets of scores that come from the same participants, without requiring the data must be normally distributed [51]. In this study, test results showed that the p-values of 35 risks were less than 0.05, suggesting there were significant differences in RC values of the most risks between green and traditional residential building construction projects.…”
Section: Risk Criticalities: Green Versus Traditional Residential Buimentioning
Abstract:Recently, an increasing number of green residential buildings have been developed worldwide owing to active promotion from the authorities and increasing interest from customers. However, in the same way as traditional residential buildings, the construction of green residential buildings faces various risks. The aims of this study are to identify and assess the diverse risks in green residential building construction projects, compare their risk criticalities with those in traditional counterparts, and propose helpful risk mitigation measures. To achieve these goals, a comprehensive literature review was first conducted, and a questionnaire was then administered to 30 construction companies in Singapore. Survey results showed that "complex procedures to obtain approvals", "overlooked high initial cost", "unclear requirements of owners", "employment constraint", and "lack of availability of green materials and equipment" were the top five critical risks in green residential building construction projects. Survey results also showed that green residential building projects were facing risks at a more critical level than those traditional residential building projects. Additionally, this study proposed fourteen risk mitigation measures to tackle the risks in green residential building construction projects. This study has contributed to the body of knowledge by identifying and evaluating the critical risks and mitigation measures in green residential building construction projects. Meanwhile, the findings from this study can also provide an in-depth understanding of risk management in green residential building construction projects to practitioners and thus benefit the practice.
“…However, the key concerns for the moderator focus on two aspects: (1) what extent the consensus can really reach up to, namely the consensus level is the actual issue the moderator cares about; and (2) how much the moderator needs to cost for reaching a consensus, i.e., the negotiation cost. Available research about consensus measure, including qualitative judgment methods (Skinner et Akiyama et al 2016), mainly focused on a single distance-based measurement of the consensus level.…”
Utility functions are often used to reflect decision makers' (DMs') preferences. They have the following two merits: one refers to the representation of the DM's utility (satisfaction) level, the other one to the measuring of the consensus level in a negotiation process. Taking the background of China's urban house demolition, a new kind of consensus model is established by using different types of multi-stage fluctuation utility functions, such as concave, convex, S-shaped, reversed S-shaped, reversed U-shaped as well as their combinations, to reveal negotiators' dynamic physiological preferences and consensus level. Moreover, the effects of the decision-making budget and the individual compensation tolerance on the consensus level are also discussed in this paper. Compared with previous research, the proposed model takes both the negotiation cost and DM's preference structure into consideration, and most importantly, it is computational less complex.
“…Each item of the questionnaire is assessed by an evaluator team with a minimum value representing the evaluators' most "conservative cognitive value" (C i ) of the item, and a maximum representing the most "optimistic cognitive value" (O i ). [63,64], is used in FDM, which is an attractive characteristic of the method. With a limited sample size, FDM can build consensus despite different perspectives from the participants while obtaining a reliable and objective opinion.…”
Section: Fuzzy Delphi Methods (Fdm)mentioning
confidence: 99%
“…Repeat the calculation for the tree scores of ", i.e., minimum ( ), geometric mean ( ), and maximum scores ( ). (3) Examine whether evaluators' judgments converge using A small sample size, mostly between 15 to 20 [63,64], is used in FDM, which is an attractive characteristic of the method. With a limited sample size, FDM can build consensus despite different perspectives from the participants while obtaining a reliable and objective opinion.…”
Section: Fuzzy Delphi Methods (Fdm)mentioning
confidence: 99%
“…The questionnaire aimed at nuclear and two-generation families in northern, central, and southern Taiwan, where 17, 10, and 15 questionnaires were distributed, respectively. Multi-criteria decision analysis (MCDA), such as the Fuzzy Delphi method and ANP, require a smaller sample size, which is typically between 15 and 20 respondents [63,64], while still deriving objective and reasonable results. This method is not only time-and cost-saving for collecting expert opinions but also sufficient for obtaining experts opinions without distortion [61,65,66].…”
Section: User Needs (Uns) For Housing and Their Weightingsmentioning
This study aims to propose design strategies for low environmental impact (low-EI) housing in the tropics while incorporating user needs to increase its acceptance in the market. The Fuzzy Delphi method (FDM) is adopted initially to draw the user needs for contemporary housing, after which the crucial design factors are identified. The analytic network process (ANP) and house of quality (HOQ) are further utilized to incorporate weightings of user needs into crucial design factors to establish appropriate design strategies. The results show "utility" (0.177), "durability" (0.169), and "comfort" (0.168) are the three greatest user needs for housing. After incorporating the weightings of user needs into design factors, building layout (0.334) and materials (0.302) turned out to be the most important considerations during the planning phase of the design procedure. Correspondingly, during the detailed design phase in the procedure, the most important factors are "low-EI material" (0.195), "orientation" (0.176), "building relationship" (0.158), and "energy-saving material" (0.107). The findings stress the significance of architectural programming and passive design for wider acceptance of low-EI housing in the tropics.
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