As far as intelligence as a factor influencing learning in general or foreign language acquisition is concerned; again, rather controversial results have been found. First of all, there is no clear evidence whether aptitude and intelligence are separate issues. Ellis (1985:11) argues that ’aptitude’ is to be contrasted with ’intelligence’, as the first refers to the special ability involved in language learning and its effects are “measured in terms of proficiency scores achieved by classroom learners” ’Intelligence’, on the other hand, refers to the “general ability that governs how well we master a whole range of skills, linguistic and nonlinguistic.” On the other hand, Oller (1980, according to Ellis, 1985) states that general intelligence and ability to use language in language tests is essentially the same. Whether we are in favour of the first opinion or the latter, most authors believe intelligence is one of the factors influencing foreign language acquisition