A related discrepancy between Austrian constitutional theory and Austrian political practice is that the constitution defines the President of the National Council to be Austria's second highest public official, junior only to the president of the executive. As a practical matter, the President of the National Council is a representative of rather moderate significance: wielding less power than the head of cabinet or even most federal ministers. The President of the National Council thus serves mostly as a more or less nonpartisan moderator of parliamentary debate. The ability of a legislature to serve an effective oversight role depends not only on its internal structure, but also on powers enabling it to compel the production of information or testimony necessary to its review.