W5.2_MFO_ OmniClass and 3D WBS on Gas Metering System Installation

1.      Problem Recognition, Definition and Evaluation

A company will install Ultrasonic Gas Metering Station for our project. Is the use of OmniClass or 3D WBS can be applied to this project? Which one is better?

2.      Development of the Feasible Alternatives

There are three (2) WBS alternatives to compare to answer the question above:

  1. OmniClass is a means of organizing and retrieving information specifically designed for the construction industry. It consists of 15 hierarchical tables, each of which represents a different facet of construction information or entries on it can be combined with entries on other tables to classify more complex subjects.

OmniClass Table 31 Phases: Table 31 – Phases, is the only OmniClass table that explains the stages (higher level of categorization than phases) of the project activity from conception until project closure.

  1. 3D WBS is based on three main dimensions: Zones Breakdown Structure (ZBS), Products Breakdown Structure (PBS) and Activity Breakdown Structure (ABS).

Fig 1. 3D WBS

3.      Development of the Outcomes for Each Alternative

a. Omniclass table 31 phases

Fig 2 – OmniClass Table 31 – Phases – WBS

b. 3D WBS Model

Fig 3. 3D WBS Model

We will compare both alternatives using Lexicography, one of non-compensatory models for multi attributes decision making technique.

4.      Selection of a Criteria

There are four (4) criteria that have been selected as parameters to analyze and compare the above alternatives:

  1. WBS level of details, this will explain how detail each alternative structures their WBS for design process.
  2. Number of design activity phase, is the number of engineering phase from the project scope development to the final design.
  3. Work flow of activities, is how the activities work together from the project scope development to the final design.
  4. Complexity of the WBS

5.      Analysis and Comparison of the Alternatives

Summary information for each alternative :

Table 1 Data Comparison

All attributes in table 1, be ranked in order of importance by doing paired comparison between each possible attribute combination. Result as shown on table 2:

Table 2 – Ordinal Ranking of Attributes

Based on table 2, the ranking is found to be WBS Level of details > Number of design activity phase  > Work flow of activities  > Complexity.

6.      Selection of the Preferred Alternative

Considering the above ranking, the 3D model was found the optimum selection as to be adapted to standardize the WBS.

7.      Performance Monitoring and Post Evaluation of Results

Monitoring and supervision should be conducted strictly during project to keep the project inline with the WBS.


  1. Humpreys, G. C. (2011). Project Management Using Earned Value (2nd ed.). Humpreys & Associates, Inc.
  2. W16_GW_OmniClass and 3D WBS on Pipeline Installation. (2014, June 15). Retrieved from Kristal AACE 2014 : https://kristalaace2014.wordpress.com/2014/06/15/w16_gw_omniclass-and-3d-wbs-on-pipeline-installation/
  3. OmniClass. (2017). Retrieved from OmniClass: http://www.omniclass.org/
  4. Syafri, F. (2013, October 8). Managing Small Project: Omniclass 3D WBS. Retrieved from Simatupang AACE 2014: http://simatupangaace2014.wordpress.com/2013/10/08/w6_afs_-managing-small-project-omniclass-3d-wbs-2/
  1. Moine J-Y. 2013.3D Work Breakdown Structure Method, PM Word Journal Vol. II, Issue IV–April 2013
  2. Elrashid, M. (2013, January 2). W10_Mohammed_ Our Current WBS Vs OmniClass and 3D model. Retrieved from Mahakam preparation Class of AACE 2012: http://aacemahakam.blogspot.com/2013/01/w10mohammed-our-current-wbs-vs.html

2 thoughts on “W5.2_MFO_ OmniClass and 3D WBS on Gas Metering System Installation”

  1. Sorry Pak Fakhril but you are still hanging onto that 3D model when that is only ONE example of the possible combinations and permutations you may end up with. What you need to show under feasible alternatives are all 15 tables. THEN you need to create a scoring model (as you did) but apply them to all 15 tables. Once you have graded them only then will you know if you have a 3D, 4D, 5D or even 6 or 7D model.

    Go to the powerpoint slides I sent you and look at the last slide. THAT shows you how many combinations and permutations you can possibly have:
    ABS = Activity Breakdown Structure
    CHBS = Change Breakdown Structure
    CLBS = Claims Breakdown Structure
    CPM = CPM Schedule Breakdown Structure
    CTBS = Cost Breakdown Structure
    CWBS = Contractual Breakdown Structure
    PGBS = Progress Breakdown Structure
    PRBS = Product Breakdown Structure
    RKBS = Risk Breakdown Structure
    RSBS = Resource Breakdown Structure
    WBS = Work Breakdown Structure
    ZBS = Zone Breakdown Structure
    Jean Yves has only shown you his three favorites. Yours may be entirely DIFFERENT.

    Bottom line- DROP the 3D model for the time being. (You can bring it back AFTER you decide which of the 15 tables you want to use, understanding that you may very well end up with 4 or even more dimensions not only 3)

    Give me a call if you want me to explain it to you rather than having me keep rejecting your blogs.

    Dr. PDG, Jakarta

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