Until we are able to use unique, unambiguous identifiers to relate RDA entities, we need to have the AAP be unique, to funtion in lieu of the identifier. Don't confuse AAPs with preferred names, which are of course subject to ambiguity. The point of AAPs (or "established name headings" in our previous way of speaking) is to eliminate the ambiguity.
Kevin M. Randall
Principal Serials Cataloger
Northwestern University Libraries
Proudly wearing the sensible shoes since 1978!