This issue contains proceedings of a colloquium on linguistics at the University of Neuchatel: (1) "Propositions epistemologiques pour une etude du bilinguisme (Epistemological Propositions for a Study of Bilingualism)," by B. Py; (2) "Comment on di ca? Prolegomenes a une etude de la composante semantique du langage des migrants (How Do You Say That? Prologue to a Study of the Semantic Composition of Migrants' Speech)," by G. Ludi; (3) "Comportement et Conscience du Comportement (Behavior and Awareness of Behavior)," by A. Berthoud; (4) "L'acquisition d'une deuxieme langue par des adultes immigres (Acquisition of a Second Language by Adult Immigrants)," by C. Perdue; (5) "Attitudes linguistiques: esquisse d'une typologie (Language Attitudes: Outline of a Typology)," by D. Apotheloz; (6) "Fur eine Untersuchung der Muttersprache italienischer Gastarbeiterkinder in Kontakt mit Deutsch (A Case for an Examination of First Language Usage by Children of Italian Workers in Contact with German)," by A. di Luzio; (7) "Langues et dialectes en contact dans les billes industrielles de l'Italie du Nord: bilinguisme et migrations italiennes (Contacts between Languages and Dialects in Industrial Sections of Northern Italy)," by G. Berruto; (8) "Migration interne et changement de langue a Bruxelles (Internal Migration and Language Variation in Brussels)," by P. Nelde; (9) "L'enseignement en langue maternelle aux enfants des travailleurs migrants: une etude de cas a la lumiere d'arguments theoriques (Native Language Instruction for Children of Migrant Workers: A Case Study in Light of Theoretical Arguments)," by A. Verdoodt; and (10) "Etude du processus d'apprentissage de l'orthographe francaise par des adolescents migrants (A Study of Procedures for Learning the French Spelling System used by Migrant Adolescents)," by M. von Allmen. (AMH)