For office diagnosis of intelligence, one's clinical judgment, based on the developmental history, medical history, observation of the child, and the child's ability to carry out a few simple directions, is fairly accurate in determining if the child is functioning at a retarded, average or superior level. Whether the child is actually feebleminded or suffering from brain damage on schizophrenia or affected by a reading problem is sometimes much more difficult and time-consuming, although there are suggestive findings in the office examination. If necessary the level of intelligence can be confirmed by more exact measurements.