Here's a diagram I drew a couple of years ago, when I was first trying to figure out the core services that make up our technical infrastructure. If I did it again today, I'd do it differently, but in the interest of discussion, I'm posting it as-is.
Decoding some of it: "ILS" is Integrated Library System; "CISR" is Comprehensive Index/Search/Retrieval; "IR" is Institutional Repository. If I re-did it, the CISR and IR functionalities would get blended together and then un-mixed into something like "Digital Collections" and "Digital Content Management".
Blue arrows represent all of the harvesting that turns the CISR into an FRD ("Federated Resource Discovery") service. Red arrows represent peering relationships with sister institutions that in turn elevate an FRD into a GFRD ("Global FRD").
Anyway ... worth what you paid.
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