This Handbook contains eight sections: history, languages and dialects, language contact, morphology, syntax, phonetics and phonology, socio-cultural aspects and neuro-psychological aspects. It provides not only a diachronic view of how languages evolve, but also a synchronic view of how languages in contact enrich each other by borrowing new words, calquing loan translation and even developing new syntactic structures. It also accompanies traditional linguistic studies of grammar and phonology with empirical evidence from psychology and neurocognitive sciences. In addition to research on the Chinese language and its major dialect groups, this handbook covers studies on sign languages and non-Chinese languages, such as the Austronesian languages spoken in Taiwan.