French gender marking errors made by 23 Anglophones and 20 Lusophones are analyzed. The observation is made that the errors noted are due to frequent arbitrariness of this particular aspect of the language. It is concluded that the arbitrary portions of this feature of the language are subject to remaining indeterminate in second language grammars, resulting in preformance confusion. It is suggested that these observations provide a contradiction to the interlanguage idea of systematic adherence to principles such as that of markedness. (SR)