According to this report, the accomplishments of the Sociolinguistics Studies on Southwest Bilingualism have been to (1) elicit a corpus of the speech (Spanish, English, and Mixed) of several hundred young adults and set up taxonomies of leading variables in both languages; (2) devise and apply a Sociolinguistic Background Questionnaire with over 90 demographic, attitudinal, and language usage items; (3) established working hypotheses for correlating such data with school performance records; and (4) develop a tentative working model (rational bilingualism) to correlate social and educational factors with language skills. Applications of the growing data bank are anticipated in programs aimed at curricular change for culturally and linguistically divergent pupils and students, special texts and programs intended for bilinguals in both Spanish and English, and attitudinal profiles of bilinguals/biculturals useful in understanding and coping with the special problems of this population and related ones (Puerto Rican, Cuban, and other Spanish-English speakers). (Author/SK)