Languages change in both monolingual and multilingual environments. Multilingual communication involves using more than one language/dialect simultaneously in a communication environment. Although language mixing is observed initially at the surface level, structural and grammatical changes may also take place at the underlying levels depending on other variables in the context. There are challenges in identifying, processing and categorizing different types of changing and stable linguistic structures. This research tackles these challenges across contexts and media through applying methods of analyses from different fields (e.g. computational linguistics, linguistics and sociolinguistics).