Many GMAT test-takers are often confused by how scores are generated for the test. Lots of this confusion stems from the seemingly straight-forward, but not easily explained, notion of a Computer Adaptive Test (CAT).
The confusion is pervasive enough, it seems, that GMAC often makes a point to clarify what a CAT is and does at various conferences, on their website, and on their official GMAT Blog. In a recent blog post, Dr. Eileen Talento-Miller provided some information about how CATs are designed and how they function in a way that even us lay-people can understand. Dr. Talento-Miller is a Ph.D.-certified psychometrician, and in many respects she does a sound job laying out the CAT basics in an easy-to-digest fashion.