Describes the complex multilingual situation that exists among the Tucanoan language groups in Columbia and Brazil, which illustrates interrelationships among cultural patterns and values, language attitudes, language use, and language survival. The groups are patrilineal and patrilocal; thus one's primary language is one's father's primary…

Strategies are developed for understanding how language variation limits communication. Methods of measuring communication are discussed, including an intelligibility measure used in the Solomon Islands. The analysis of data gathered using communication measurement is discussed. The result of the analysis is a determination of the number of…