It continues from Post W18_PieroAnticona_Comparing 5D BIM Estimates against other Estimating and Budgeting Process Map. Part 1
1) Step 5- Compare the outcomes from each alternative analysis done in Step 3 against the minimum acceptable criteria from Step 4.
To assess the differences of probabilities and consequences, it is necessary to understand the following figure that shows the involvement of stakeholders and the activities during the execution of difference phases comparing a traditional Project Delivery phase and the Integrated Project Delivery.
Figure: Project Integrated Delivery: Working Definition
Analysing the Integrated design process, according to the graphic, planning construction activities and accountability of responsibilities start since the conceptualisation phase. Besides, constructors are also involved since this phase. This early participation and also, the definition of how to construct and who will have an impact on the factors that might affect project cost.
For a traditional project delivery process, the analysis would be:
After assigning to each factor a probability and a consequence we get the following rank:
The list in order of weight is as follows:
Also, the Strategy to mitigate, avoid, transfer or accept risk might be different because the weight is also different. The next table shows the strategies determined to the same factor for a different project delivery process.
2) Step 6- Selection of the “best”.
As the reader can observe, for the same factors, the weight determined for IPD approach is lower in most of the cases. This means that despite that strategies are similar in most of the cases the impact of the factor affecting the project cost is lower in the case of the IPD approach.
This result might demonstrate that having a lower impact on the project cost, BIM with the IPD approach is a better process than a traditional one.
3) Step 7- How to plan on tracking/reporting on recommended choice.
Considering that the weight of the probability and occurrence of the factors is lower when using BIM, it might lead to calculate a low contingency. Then, the factors must be monitored, and low use of contingency will determine that the project estimate was well calculated.
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