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All languages are systematic and have structure; it may not be wholly systematic and rule-governed, in the sense that we may not be able to discover all the rules and all the systematicity, or there may even be areas that defy systematization. But we are going to assume that unless proven otherwise, there is system that we can discover and that is the goal of linguistics. If the system and structure we discover is different from what previous analyses of the language have said, we will ask for proof that the new description is better, and then we will replace the old description with the new one. And we will also recognize that there are areas of language that are vague, ambiguous, in flux, shifting, being negotiated. But at the core we expect to find a code that has its own rules.