help me understand the Canadian national science advisory structure

So there is Dr. Arthur Carty, National Science Advisor to the Prime Minister, in the Office of the National Science Advisor, which I guess is in the Privy Council Office?

That's what I just wrote in Wikipedia: National Science Advisor (Canada), is it correct?

UPDATE: The website is quite hard to find, but I located it eventually, it's http://science.pco-bcp.gc.ca/

The National Science Advisor is ex officio on the Council of Science and Technology Advisors (CSTA)

The Council of Science and Technology Advisors (CSTA) is the external advisory body that provides advice to Cabinet on the management of the federal science and technology (S&T) enterprise.

Ok, so far so good.  Except there is also this thing called the Advisory Council on Science and Technology (ACST)

The Prime Minister’s Advisory Council on Science and Technology was created on July 5, 1996. The Council’s role is to review Canada’s performance in research and innovation, identify emerging issues of national concern, and advise on a forward-looking agenda with a view to positioning Canada in an international context.

And there (used to be?) the Science and Technology Foresight Directorate for Canada at http://www.techforesight.ca/ (site currently says "forbidden").

There's also the Canadian Foundation for Innovation.

Help!
How does this all fit together?
Does this structure still exist under the Stephen Harper government?

UPDATE 2006-02-23: It's even worse than presented above, there's also the Canadian Academies of Science, which I just discussed in a new posting 1st President of Canadian Academies of Science appointed.

Previously I attempted to figure out some of this complexity in
June 20, 2005  overview of scholarly communication in Canada