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A language survey is conducted around the world for a variety of reasons. *measuring people's ability to speak and understand another language (usually community based, not school based) (multilingualism) *studying people's attitudes about different languages (Rensch 1993) *evaluating the differences and similarities in speech of communities that speak related speech forms, noting comprehension or collecting details of linguistic form (dialectology) (Labov 1982, Backstrom 1992, Egland 1978) *assessing the vitality of languages that may be disappearing (language death) (Statistic Canada 1993, Ferreira and Holbrook 2002) *doing initial descriptions of languages in areas that are linguistically undescribed (King and King 1984) == Methods == Methods used in language surveys depend on the questions that the survey is trying to answer. Methods used include collecting word lists (Bender 1971), playing recorded texts to assess comprehension (Casad 1974), sentence repetition tests (Radloff 1991), questionnaires (Hochstetler and Tillinghast 1996), group and individual interviews, retelling of stories (McKinnies and Priestly 2004), direct observation (Cooper and Carpenter 1976), and even internet surveys (tafesilafai.org). As with any form of research, the methods used depend on the questions that the researchers are trying to answer. Also, the reliability of the results varies according to the method and the rigor with which it is applied, proper sampling technique, etc. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「language survey」の詳細全文を読む スポンサード リンク
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