In the second issue ofMedical Teacher(1979, 1, 65-70), Professor R. M. Harden gave an overview of assessment in medical education. Here, Professor Knox describes some of the issues involved in one form of assessment—the Modified Essay Question. With careful preparation, this technique can provide a measure of abilities (including attitudes) which cannot easily be assessed by other means. The MEQ can also provide a brisk learning experience in small groups or at a large plenary session.