The DDI community have undertaken some work to create a "a generic model that can serve as the basis for informing discussions across organizations conducting longitudinal data collections, and other data collections repeated across time." They call this model the Generic Longitudinal Business Process Model (GLBPM). If you are interested, you can read the paper here: http://www.ddialliance.org/system/files/GenericLongitudinalBusinessProcessModel.pdf
The main diagram for the GLBPM looks very similar to the GSBPM diagram. However they have some other views as well, like the one shown below.
Should we consider something like this diagram to be added to the GSBPM documentation?
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