W5.3_MFO_ OmniClass on Gas Metering System Installation

1. Problem Recognition, Definition and Evaluation

Our company will install Ultrasonic Gas Metering Station for our project. Is the use of OmniClass can be applied to this project?

This blog is made to revise the W5.2 blog post before.

2. Development of the Feasible Alternatives

OmniClass 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.

Fig 1. Inter-related OmniClass

Author will be chosen what kind of tables on OmniClass that applicable for Gas Metering Project WBS.

3. Development of the Outcomes for Each Alternative

To choose top four most applicable tables from the 15 tables, the most appropriate technique will be the multi attributes approach. Compensatory models, the additive weighting technique has been chosen to help performing the comparison and selection. In all compensatory models, which involve a single dimension, the values of all attributes must be converted to a common measureable scale. By using determined criteria related to the Gas Metering Project, the additive weighting technique will rank the 15 tables, shows high to low applicability and relevance to the project.

4. Selection of a Criterion

There are six criteria related to gas metering project that have been determined for the OmniClass tables selection:

  1. WBS location that related to Gas Metering Project (1-3, 3 being highest relationship)
  2. WBS deliverables related to Gas Metering Project (1-3, 3 being highest relationship)
  3. WBS activity related to Gas Metering Project (1-3, 3 being highest relationship)
  4. WBS organization that related to Gas Metering Project (1-3, 3 being highest relationship)
  5. WBS level detail completeness (1-4, 4 being preferable)
  6. Tables applicability/uses for oil & gas project (low to high)

5. Analysis and Comparison of the Alternatives

The comparison result of OmniClass Tables is shown in the following table:

Table 1. OmniClass Tables Comparison Based on Six Selection Criteria

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 OmniClass Tables attributes

Based on Table 2, relative rank = ordinal rank + 1. A rank of 5 is best, the relative ranking will become as follows:

Table 3. OmniClass Tables Selection – Attribute Weight

The attributes values on Table 1 have to be converted in to non-dimensional form. The procedure for converting the original data on table 1 for a particular attribute to its dimensionless rating is:

The non-dimensional (dimensionless) values of the attributes are shown on Table 4:

Table 4. OmniClass Tables Selection – Dimensionless Value

Finally, for each OmniClass table, the normalized weight of the attribute (Table 3) is multiplied the non-dimensional attribute value (Table 4) to obtain a weighted score for the attribute. These weighted score are then summed to arrive at an overall score for each OmniClass table. The result is shown on Table 5.

Table 5. OmniClass Tables Selection – Weighted Score

6. Selection of the Preferred Alternative

Based on calculation and Table 5 comparison, the top three most applicable and relevant WBS from OmniClass for the Gas Metering Project is:

  1. Table 14-Spaces by Form (score 0.310)
  2. Table 23-Products (score 0.357)
  3. Table 31-Phases (score 0.270)

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. Planning Planet (2017). Creating Work Breakdown Structure. Retrieved from http://www.planningplanet.com/guild/gpccar/creating-work-breakdown-structure
  2. Hendarto, Tommy. (2017). W6.1_TH_Standardized WBS Structures for Gas Station Project-Part 3. Retrieved from http://emeraldaace2017.com/2017/09/22/w6-1_th_-standardized-wbs-structures-for-gas-station-project-part-3/
  3. OmniClass (2017), OmniClass Table 21 – Elements (includes design elements). Retrieved from www.omniclass.org/tables/OmniClass_21_2012-05-16.zip
  4. Gannasonggo, Gustaf. (2012). W3_GGS_OmniClass WBS|Casablanca AACE 2012. Retrieved from https://aacecasablanca.wordpress.com/2012/02/06/w3_ggs_omniclass-wbs-table-selection-using-additive-weighting-technique/




1 thought on “W5.3_MFO_ OmniClass on Gas Metering System Installation”

  1. WOW…..! Excellent case study Pak Fahkri!!

    I really hope you are able to convnce your management to adopt Omniclass as your WBS coding structure in preparation for the day when you will be implementing BIM.

    Dr, PDG, Jakarta


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