I've discussed the merits of design and the entity here and here.
In a recent interview, the prospective employer mentioned the "party" model. I had no idea what they were talking about at the time only that it was similar to my entity model.
In another interview, I was asked about subtyping. I didn't know the vernacular as it pertained to database modeling, but I went on to explain the entity model. He told me they were one and the same! Now I have a name for it and I came to something that others had already "invented." While it would have been easier to read one of the books on modeling that discussed the Party Model, but I can't seem to read technical books (online is a different story for some reason). I also think it's pretty cool I came to the same conclusion as others outside of their influence. I do have to wonder though if I took it in at some point of time but don't explicitly recall it.
Anyway, it's definitely nice to have an idea validated.
Below are some general links on data modeling and specific ones on the Party Model:
Data Modeling on Wikipedia
A Universal Person and Organization Data Model
Siebel/Oracle - Party Data Model
Party Information Framework