I'll duplicate this comment from my previous question thread.
Sorry for saying this but i think also that your MPS' documentation is far from perfect (I've started on MPS 3.0 documentation and in process of reading this understood that there is no hope to get thorough understanding of MPS through it — if there is info in it about what are operationContexts, for example, there are no links to such info in it). I've assumed that the official way is to get through Fast Track to MPS and am now going through it. Is it the way to get MPS right in full detail?
Maybe somebody want create an issue from this (or there is no such a thing as issue about documentation?)?