3D WBS does not say that there are only 3 dimensions (ZBS, PBS, ABS) for the WBS (dimension = elementary tree structure that answer an elementary question), but it says that there are 3 MAIN dimensions in the WBS, it’s quite different! Of course there are N dimensions but only 3 dimensions must be used together (Zone, Product, Activity) for one view of the WBS.
This, because to Work (WBS) is doing (ABS) something (PBS) somewhere (ZBS). There is also the fourth dimension, the OBS which is the Organization.
If you describe your project with 15 tables, like with OMNICLASS tables, then you have to choose 3 dimensions among the 15 tables available to obtain a view of your WBS. For instance, tables 11 (ZBS), 21 (PBS) and 31 (ABS) can be used together, or tables 14 (ZBS), 23 (PBS) and 32 (ABS).
You have to join triplet of tree structures to build a WBS, but of course there are N dimensions in a project, but there are only 4 dimensions linked together for one view of the project (OBS, ZBS, PBS, and ABS).
Some tables of OMNICLASS for instance belong to the same family, I mean it is either Zone, Product, Activity or Organization dimensions. Hence, we can have parallel dimensions to the four main dimensions.
Some tables of OMNICLASS for instance belong to the same family, I mean it is either Zone, Product, Activity or Organization dimensions. Hence, we can have parallel dimensions to the four main dimensions.
