As outlined in Section IV of our METIS paper, in order to meet GSIM's objectives to enable communicating, educating and collaborating, I, with my IMF colleagues, feel the model needs fewer objects overall, and these objects should be at a higher level.
Successful education connects to people’s everyday life. It is facilitated by creating a “simple, easy to understand view of complex information, with clear definitions” (GSIM Brochure).
Creating an easily understood view also helps people collaborate. Working with others using a shared language and a common understanding helps participants feel they belong to a group much bigger than their work unit, their project team, or even their organization.
With GSIM, potential users must “buy-in” at the most detailed level of the model. There is no rigorous, agreed and coherent picture at any level above the specification, which, at nearly 300 pages, is not a usable tool for educating or collaborating.
My IMF colleagues and I believe GSIM needs a model of up to 50 high level objects as its main organizing scheme - this was echoed in the Metadata Flows paper at METIS. This model would stand as an analogue to the GSBPM model of sub processes. The two could operate in tandem as tools to educate and collaborate.