## 4 Results and Discussion
These results show that the defuzzification methods influence the output value, but they should not mark out minimal and maximal levels. The relative difference between the maximal and minimal values of \(\text{RLT}^{\text{c}}_{\text{d}}\) for two types of risk matrices ranges from 29.9% to 41.3%. Let's consider the total project duration, taking into account the \(\text{RLT}^{\text{c}}_{\text{d}}\). Firstly, determine the activity duration considering the \(\text{RLT}^{\text{c}}_{\text{d}}\) for different risk matrices and the defuzzification method. Then, calculate the project duration for each case using the CPM method and Equations (1)-(10). The results are presented in Tables 12 and 13. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{3}{*}{**Activity**} & \multirow{3}{*}{
\begin{tabular}{c} **Normal** \\ **Duration, Days** \\ \end{tabular} } & \multicolumn{6}{c}{**The Total Duration for Each Activity and Project, Days**} \\  & & \multicolumn{3}{c}{**The Defuzzification Method**} \\  & & **Centroid** & **Bisector** & **Middle of Maximum** & **Smallest of Maximum** \\ \hline \multicolumn{1}{c}{(A)} & & & & & & \\ Site Investigation and & 24 & 31 & 31 & 32 & 31 & 33 \\ Preparation & & & & & & \\ (B) & & & & & & \\ Foundation Works & 45 & 52 & 52 & 54 & 52 & 55 \\ on Section 1 & & & & & & \\ (C) & & & & & & \\ Foundation Works & 45 & 47 & 47 & 47 & 46 & 48 \\ on Section 2 & & & & & & \\ (D) & & & & & & \\ Construction of Monolithic & 39 & 44 & 44 & 44 & 43 & 45 \\ Building Frame on Section 1 & & & & & & \\ (E) & & & & & & \\ Construction of Monolithic & 39 & 47 & 48 & 48 & 47 & 50 \\ Building Frame on Section 2 & & & & & & \\ (F) & 30 & 40 & 40 & 40 & 40 & 40 \\ Masonry Works & & & & & & \\ (G) & & & & & & \\ Finishing Works & & & & & & \\ (I) & & & & & & \\ Landscaping & & & & & & \\ \hline Total project duration & 230 & 259 & 259 & 262 & 258 & 265 \\ \hline \hline \end{tabular}
\end{table} 
Table 13: The total duration for each activity and project duration for risk matrix type II with the different defuzzification methods. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{3}{*}{**Activity**} & \multirow{3}{*}{
\begin{tabular}{c} **Normal** \\ **Duration, Days** \\ \end{tabular} } & \multicolumn{6}{c}{**The Total Duration for Each Activity and Project, Days**} \\  & & \multicolumn{3}{c}{**The Defuzzification Method**} \\  & & **Centroid** & **Bisector** & **Middle of Maximum** & **Smallest of Maximum** \\ \hline \multicolumn{1}{c}{(A)} & & & & & \\ Site Investigation and & 24 & 31 & 31 & 32 & 31 & 33 \\ Preparation & & & & & & \\ (B) & & & & & & \\ Foundation Works & 45 & 52 & 52 & 54 & 52 & 55 \\ on Section 1 & & & & & & \\ (C) & & & & & & \\ Foundation Works & 45 & 47 & 47 & 47 & 46 & 48 \\ on Section 2 & & & & & & \\ (D) & & & & & & \\ Construction of Monolithic & 39 & 44 & 44 & 44 & 43 & 45 \\ Building Frame on Section 1 & & & & & & \\ (E) & & & & & & \\ Construction of Monolithic & 39 & 47 & 48 & 48 & 47 & 50 \\ Building Frame on Section 2 & & & & & & \\ (F) & & & & & & \\ Masonry Works & 30 & 40 & 40 & 40 & 40 & 40 \\ (G) & & & & & & \\ Finishing Works & & & & & & \\ (I) & & & & & & \\ Landscaping & & & & & & \\ \hline Total project duration & 230 & 259 & 259 & 262 & 258 & 265 \\ \hline \hline \end{tabular}
\end{table} 
Table 12: The total duration for each activity and project duration for risk matrix type I with the different defuzzification methods. Analyzing the data from Table 12, the maximal value of the total project duration is calculated using the largest of maximum defuzzification method, and the minimal value of the total project duration is calculated using the centroid and bisector defuzzification methods. The relative difference between the maximal and minimal project duration is 2.6%.