Q:

Should we develop nomenclature to indicate the level of sophistication on which we're answering questions?

In thinking about Ben Norris's answer to this question, asking about whether answers should contain a level of detail appropriate for the estimated knowledge of the asker, a subsequent question came to mind:

Should we develop a standard nomenclature for annotating the level of knowledge at which we are aiming our answers?

For example, using the United States educational structure as a paradigm, some (too-wordy) categories might be:

Initial learning / High school-level
Broad overview / Undergraduate-level, non-Chemistry-major
Intermediate / Undergraduate-level, Chemistry major
Advanced / Graduate-level

Such annotations would be almost exclusively useful to those with less chemical knowledge, as those with more experience should be able to sort out the 'target audiences' of answers pretty intuitively.  To the inexperienced, though, perhaps such annotations would be valuable in allowing an "Ah, I haven't been introduced to that yet, I won't worry about it too much" sort of response to high-level material, couched in a consistent, site-wide formalism.
On the other hand, it might just be more trouble than it's worth.

A:

On the other hand, it might just be more trouble than it's worth.

In my opinion you actually answered your own question in this last sentence: it more likely to do harm than good. In general, I totally agree with what Ben Norris said in the linked thread:

More importantly, providing multiple answers is true to the Stack Exchange model!

So I always look at the possibility of multiple answers as a feature of Q&A model rather then a bug. And in this particular case of multiple answers at different levels to the same question, I think it is indeed better for community to keep the answers in one place rather then spreading them out. Note that I explicitly emphasize the key phrase: it will be better for community, non necessarily for the original poster (OP). And here (at StackExchange network) I think we have to put what community needs before what OP wants simply because OPs come and OPs go, but community stays. Multiple answers at different levels in one place will be much more useful, again, for community, and easier to handle.
P.S. Besides, I think we should follow what the "elder brothers" (Physics.SE and Math.SE) do: they did not introduce such tags (though, there were some similar proposals) so shall we.

