A FAMILIAR sight in the newspapers and weekly magazines is a world map (often, I regret to say, on the Mercator projection) on which population, oil production, or similar information is shown by rows of small men, barrels, or other appropriate symbols. These maps are often interpreted in caption or accompanying text as indices of national power. No one denies that such information is relevant to power, but no reader of this journal needs to be cautioned that such information is only a first step toward an evaluation. The present paper spells out that caution and tries to take another step or two. Its thesis is: An estimate of national power has two aspects which are related, in a figurative way, like the two rays of a triangulation. Either ray gives direction, but it takes the two to give distance. A better analogy, perhaps, is that of two searchlight beams groping through the dark until they intersect on the target. One ray or beam is the conventional inventory of the elements or factors of power. It gives the power resources of a nation, using “resource” in a broad sense. The other ray is here called “national strategy.”