Historical linguistics and complexity science would make a great pair. CS predicts the variation that is an inherent part of language and the history of a language. Both regional and specific populations within a group could and do develop different characteristics. Even the vocabulary that is used in a given language is a result of the interaction in the complex system. Certain generalizations can be made about these characteristics based on the most frequent aspects of the nonlinear curves (the Great Vowel Shift in English is an example), but the changes that follow and occur will appear and form at different paces in time and history. So any “formal statements we make should reflect what we know about the emergence of scaling, nonlinear frequency patterns from the complex system of speech” (Kretzschmar 2009).