At each successive revision, the ISCWSA has generally advocated that the most current revision of the MWD model is promoted and should be used. In practise, software implementations have lagged behind updates of the model and also certain companies have made a conscious decision not to move to the latest versions. Therefore, a range of versions of the ISCWSA model can be found in the industry.
If starting from scratch, there is no reason why an implementer could not go directly to the most current version of the model and ignore the history that goes before. However, in practise of the basic framework of the model is incorporated then the overhead in adding the additional depreciated weighting functions is not too great. There may be an advantage in the flexibility to allow older versions of the model to evaluated or accommodate.
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