Bilingual or multilingual speakers are often code-switchfrom one language to another, especially when two or morelanguages are used in the environment. This article exploresthe potential theoretical explanations for this languagebehavior and the role of language dominance in thedirection of switch. The data consists of primary andsecondary data. The primary data were collected from dailyspeech events in the various domains. The secondary data isany information other than the primary data which supportthe primary data. In short, code-switching follows thefunctional and the grammatical principles and is a complex,rule-governed phenomenon. The use of Buginese language(BDS), Malayic-Buginese language (DMB), and Indonesianlanguage (BI) have led to the functional elaboration of alllanguage beside Konjo language (BK) in the Konjo speechcommunity in Sinjai. There are some factors governing thecode-switching process in the Konjo speech community inSinjai. They are: (1) the language abilities of the speaker andthe addressee, (2) the setting and the situation, both officialand non-official, (3) the participants in the interaction, and(4) the aim of the speech act.