I only have a minute, and in some ways managing organizational records is as much an art as a science, but here are a few thoughts. (I should add that our Advancement database, in Ellucian Advance, is a stand-alone database used just by Advancement, so we don't have to worry about how Finance or Career Services or HR or anyone else want to organize their organizational data.)
Our starting point is that we try to create records only for organizations that are distinct legal entities, so we try not to create entities for the branch of a bank or a department at a university. That separate entity might be the subsidiary of another corporation, but in general would be a distinct entity.
Within that rubric, we try to create records mostly for organizations when having a record would support some Advancement purpose or activity, for example
- when we have (or intend to have) and manage a relationship with the entity. That may mean that they're considered a prospect, for example.
- when they make a gift, with an organizational record created for the entity that Gift Registration identifies as the legal donor.
- When it's useful for organizing other data, such as creating a record for an organization where we have employment information for a number of individual constituents
Our current pan-institutional Advance implementation pulled together many individual museum/unit databases, so we had quite a few duplicate records to review and resolve, which we did using the basic rubrics above. One red line was that we needed to maintain any record for any entity that was the legal donor for a gift. We could merge it with other records for the same entity, but not, for example, merge it with the record of a company that acquired it (in which case we inactivate the legal donor entity and link it in an organizational hierarchy as merged/acquired.)
My US$0.02 worth; the usual disclaimers apply.
Good luck!
Alan
Alan S. Hejnal
Data Quality Manager

Smithsonian Institution - Office of Advancement
600 Maryland Ave SW Ste 600E
PO Box 37012, MRC 527
Washington, DC 20013-7012
Voice: 202-633-8754 | Email: HejnalA@si.edu