I conclude my writing style has not helped soliciting responses. I would appreciate them. Summary - what I would like to say - is that there are platforms that have been successful in applying PEP425's definitions of tagging Python and modules. Looking at the modules pip and wheel I can verify it is already possible to build and install wheels on AIX. However, the tag provided by CPython is inadequate for "pip wheel" to create a wheel that could be used, safely, by AIX on a different OS level. I use the term safely because it might work, but it is just as likely that it will not. Even if the PEP425 tag for AIX is not used in ways similar to ways that macOS and linux1 tags are used (supporting multiple OS levels) a better tag is needed to "stamp" the current ABI characteristics - including 32 or 64 bit (or perhaps both). For simplicity I would start with "bit-signed" tags. Please note: while AIX may not be the most popular platform to develop on - there are Python based applications that are used on AIX. The lack of certain behaviors that are taken for granted on other platforms hampers admins, architects and businesses that wish to use Python apps in a heterogeneous environment. Thank you for your comments! Michael