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Part #70: Thoughts of Xavier LEYNAUD

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When I work on the concept that Jean-Yves develops long time ago, it was specially because I was “fed up” with the hierarchical approach that imply most of the WBS, and the fight about its standardization.

I study conception for management software engineering in my youth, and I always keep a fascination to the relation database model.


So my eager was to find a way to modelize something and respond to everybody in the company by turning it up in every senses in one instant.


So as I work mainly in my youth with Artemis, with the very structured codification environnement of oil and gaz (Mobil and then Exxon), I simply use without knowing it this 3D approach to do the trick.


Then I met Jean-Yves, that push the concept so far that new frontiers appears (in addition to the speed to develop a schedule).


In particular, what is very important for me is the following:
  • 2 of The 3 type of codification (ABS & PBS) are fully able to be standardize in the company without fight (even if you should be careful with” PBS” that in fact is 2 codes and decompose it for the exercise in pure PBS and FBS to match the need of some of the phase of the ABS because you began to think functionnaly, then you go through the product, before finishing functionnaly)
  • ZBS (Zones) is specific to each project and can support the instantiation of the product (but could follow some guideline in its definition in particular the unicity of each code -  no overlap-)
  • Different level of each of the structure could be mixed at different stage of the project and depending the use of your WBS to create the project WBS (you can have a detail difference in your WBS for procurement and manufacturing because you manufacture some items for example), and the approach is still coherent,
  • When you create your mix with the OBS to obtain the share of work, you obtain as more difficult interface than the fundamental dimension of the WBS component are far in the concerned branch of the code (that lead to create an allocation of the package reducing those gaps to simplify the interface).

Thus I without knowing it implementing it till many years, but with the full modelization of Jean-Yves is able to succeed in standard codification in my company because I say no more froze hierarchical WBS, just ABS, PBS, SBS/FBS and rules to create your ZBS. Then NO PACKAGE WITH TOO GREAT GAP ON EACH OF THE DIMENSIONS (or with logical huge gap like company who you subcontract high level specification and functional test & commissioning).


WBS is dead, because 3D WBS allow you to keep it “relational” instead of hierarchical and this does the trick with a lot of things, specialy with those “fuc…” computerized financial management systems called ERP that most of the time impose to you a 20 digits codification (when not more) to link everything when a anonymous code will be greater if you use the 4 codes composing the 3D.


Xavier Leynaud

ALSTOM Renewable Power Hydro, Head of Planning & Load Management HEU Projects





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