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Here's the example.

Can you please tell what and how you answered this question "The evidence is insufficient to clearly demostrate that exemption (of labor certification) would be in the national interest."

The lawyer did all that, but if I understand correctly. the logic reasoning is like:
1) assume that the point I am exceptional among peers and better than most peers with similar background and experience has been proved and accepted.
2) assume that the point the project I am working in is of National Interest has been proved and accepted.
3) assume that the point I am key to this project has been proved and accepted.
4) LC will qualify any candidate with MINIMUM qualification to take my role.

Now it is easy:

The only thing that needs to prove is that the project CANNOT be finished with only MINIMUM qualification. (Simply raise the bar through your employer AND other people who has the authority to judge it)

So, if taking LC process, other candidate with MINIMUM qualification will take the role, and he cannot meet the project requirement, and the project cannot be finished as expected(in terms of both time and the results), the national interest will then be adversely affected, so only I can do it and not adversely affecting the National Interest, hence the exemption of LC is of National Interest.

Usually 1) and 3) are easy, but 2) may not apply to some fields. I happen to work in a field that is related with early detection of drug's side effects, I associated this with the recent Cox-2(Vioxx...) news with Merck and Pfizer, which makes it clearly that the project is of National Interest, because it will reduce the risk of millions of US patients' life and will save drug development cost significantly and ultimately reduce the US patients medical cost, of course another National Interest.

But I think some field may be harder to prove the point 2). If you are working on a project making good web searching algorithm, though you are the best, but since there are Google out there, there is no URGENT need from the National Interest point of view so if the project loses you National Interest will not be affected too much, as there are still other replacement/similar technologies.

So, make sure to find out the uniqueness of what you are doing.