I'm trying to design the IA for an application that has strong
elements of two different organizational patterns.

Looked at in one way the information very much resembles a directory
or phone book (primary use cases are things like "find the phone
number of $NAMED ORGANIZATION").

Looked at another way the information very much resembles a net- or
tree-like hierarchy (example case "find the company for which $NAMED
PERSON is the sales representative). Unfortunately, about 30% of the
data elements do not fit into the hierarchy.  They'd be a very large
group of "others".

Preliminary interviews with users shows about a 50-50 split between
the two types of use cases, with no strong bias I can find.  The users
are demand-driven, responding to unpredictable requests from other
people so they can't control ahead of time what requests or even what
types of requests they get.

I don't think I want to create two screens for the same person, nor do
I want to make things strongly modal.  (But maybe I'm wrong about
that?)

I'm looking for any good examples of cases where people have blended
these two types of organizational schemes.

TIA,
--Alan
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