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There is the "problem" of ISO. If we refer only to general guidelines, we have only "core" and "secondary" level. This because we have set as: "ATAG Guidelines refer to part 7.2 of the document that contains general guidelines where the following requirements refer to "Application": 7.2.1.1 (core), 7.2.1.2 (secondary), 7.2.2 (core), 7.2.3 (secondary), 7.2.4 (core), 7.2.5 (secondary), 7.2.9 (secondary), 7.2.10 (core), 7.2.11 (secondary), 7.2.12 (core) and 7.2.13 (secondary)."
From ATAG call 14 Feb 05: A = core AA = core AAA = core and secondary