AbstractStudied the effect of linguistic development and social appropriateness of a language upon the meaningfulness of personal constructs articulated in this language. Subjects were 60 bilingual pupils from a boys secondary school in Tanzania. Linguistic development was manipulated by choosing pupils who had either 1½ years or 3½ years experience of instruction in English. For each subject constructs were elicited and grids administered in both English and Swahili. Two types of elements were used, for one of which Swahili was the socially more appropriate language and for the other, English. Results from the study indicate that rating polarization is a function of both linguistic development and appropriateness of language for construing the domain in question. These results are therefore interpreted as indicating that meaningfulness of personal constructs, as indicated by rating polarization, can have linguistic determinant