The performance of Nigerians, and of others for whom English is a second
language, on tests of intelligence and English language has not been encouraging. Some reasons have been advanced for the poor performance (See Obemeata, 1976; Tomori, 1967; Itsuokor, 1987). Among factors related to reading are background experience, reader’s purpose and attitude, personal experiences with a particular type of organisational format, language processing systems familiarity with subject matter, native intelligence, the physical and psychological state of the reader, his reading habits and his environment. On tests of intelligence, the factors include the nature of instruments used, standardisation of sample and environment. This paper, therefore, presents an analysis of the factors common to both tests of intelligence and reading comprehension which could affect performance in these tests.