This study examined the interlanguage syntax of Arabic speaking learners of English in the area of the noun phrase, focusing on the closed system elements that can occur before or after the noun head, the noun head and pronouns in line with Quirk and Greenbaum's (1977) treatment of the noun phrase. Participants were 25 Arabic speaking English language learners from seven Arab countries attending an intensive English program at the University of Texas Austin. The first 500 words of each student's oral production were analyzed, and a typology of errors based on a pilot project was established. Results indicated that noun phrase errors were second to verb phrase errors, forming 32.8 percent of the total number of errors in the sample. The most frequent noun phrase errors were in the use of articles, particularly the omission of the indefinite article in obligatory contexts, the use of "the" redundantly, omission of the article "the," and redundant use of the articles "a" and "an." Ordinals were used interchangeably, and quantifiers were confused as to their use with count/noncount nouns. Arab learners from different dialect backgrounds had different problems. Errors made by Arab learners of English were very similar to errors made by learners from other language backgrounds. (Contains 47 references.) (SM)