This document discusses various concepts related to language choice in multilingual communities, including: - Diglossia, which describes a situation where two distinct language varieties have clear functional separation between domains. Examples given are Standard Arabic/colloquial Arabic and Standard German/Swiss German. - Polyglossia, which refers to conditions where a population speaks more than three languages, as in Singapore where Mandarin, English, Hokkien and Cantonese are all used for distinct purposes. - Factors beyond domain that influence language choice, such as social distance between speakers, their social roles, level of formality, and purpose of interaction. - Attitudes toward 'High' and '