[5] The data will be used to convince clients to select a specific subcontractor
especially when clients have different preferences in selecting specialty contractors rather
than a general contractor.
[6] The data would be used for bidding the future project using specific
subcontractors since they can have more specific cost data for each subcontractor.
Results 6. Limitations or Area for Improvement
The following problems were identified through discussions with participants.
[1] Even though the performance of a specialty contractor does not change, overhead
costs might differ depending on the personnel in charge. A project manager who
interviewed the authors mentioned that if an experienced HVAC coordinator was
replaced by a less experienced one, the overhead costs would increase.
Therefore one strong assumption for PPA analysis is that salary or wage reflects the
experience and ability of personnel. For example, $2,000 salary scheduler is twice as
efficient as $1,000 salary scheduler.
[2] One activity such as phone calling can be involved with several management
areas. In our study, 10 min is assumed to be dedicated to quality and 10 min to
procurement in case a 20 minutes phone call is made for quality and procurement.
[3] Several costs objects overlap. The form itself is problematic. Some participants,
for example, indicated that area sequence and scheduling are somewhat superimposed.
[4] There are environmental factors that partially determine the level of efforts
required in the work of construction management staff. Among these factors quality in
documentation is very important. Other factors are not examined in this case study.
CONCLUSION
This