Procurement and Contract is the next phase in the project execution stage after the engineering phase is completed. The previous blog posting has discussed the comparison of Work Breakdown Structure (WBS) in the Engineering phase. This posting will discuss the selection of appropriate WBS in the Procurement and Contract phase.
Two alternatives of WBS Data base are considered:
1. CSI Master Format
“Is the specification -writing standard for most commercial building design and construction projects in North America. It lists titles and section numbers for organizing data about construction requirements, products, and activities”.
2. OmniClass 31
Table 31 Phases, the only OmniClass table that explain the stages (higher level of categorization than phase) of the project activity from conception until project closure, including Procurement and Contract phase.
There are three (3) criteria that have been selected as parameters to analyze and compare the alternatives:
- WBS level of details , this will explain how detail each alternative structures their WBS, expressed by the number of WBS level.
- Relationship of WBS item with the specified work activities/stage, is how close each alternative express the specified work activities/stage (or the content of the WBS).
- Work flow of activities, is the sequence of activities in the Procurement and Contract Stage.
Analysis and comparison for each alternatives
Lexicography, one of non-compensatory models for multi attributes decision making technique is used for the analyzing the alternatives. The following figures show WBS of each alternative:
Each WBS Database comparison is expressed in the following table:
Table 1 – Summary Information of Procurement and Contract Phase
All attributes in table 1, be ranked in order of importance by doing paired comparison between each possible attribute combination. Result as on table 2:
Table 2 – Ordinal Ranking of Attributes
Based on table 2, the ranking is found to be Relationship of WBS items > WBS Level of details > Work flow of activities.
The application of lexicography to the ordinal ranking developed in table 3.
Table 3 – Application of Lexicography in Procurement and Contract Phase
The preferred alternative according to table 3 is CSI MasterFormat. This is because the relationship of WBS item (or the WBS content) and WBS level of details are the two top ranked attributes, and the CSI MasterFormat is the best of all in these two attributes. In the Procurement and Contract stage, CSI Master Format shows its dominance on Omni Class, especially as it has clearly defined all forms and requirements during this phase. These details will be valuable information and check list for the project team during the preparation of procurement and contract documents.
The next step will be to build up WBS for Procurement and Contract stage using CSI MasterFormat to prove whether the conclusion above is correct, and start evaluating the impact during tender and procurement phase.
CSI OmniClass (2010), OmniClass A Strategy for Classifying the Built Environment [OmniClass Table 31- Phases]. Retrieved from. Retrieved from http://www.omniclass.org/tables/OmniClass_31_2006-03-28.pdf
Sullivan, G., William, Wicks, M., Elin, Koelling, Patrick, C. (2009), Engineering Economic, Fifteenth Edition. Pearson International Edition.
CSI, CSC (2011), Master Format Numbers and Titles.
 CSI, CSC (2011), Master Format Numbers & Titles, page 1