Although there are certainly observable frequency effects in language, in most cases, there are alternative approaches to explanation that more directly relate to the essential characteristic of language—that it is a system relating form to meaning. For example, for both word choice in production and ambiguity resolution in comprehension, meaning-based approaches can often provide equally satisfying, or more satisfying, explanations. In the meaning-based approach, the statistical structure of the language can affect the development of linguistic knowledge (for example, by influencing acquisition order or providing evidence for developing grammars); however, linguistic knowledge is not itself knowledge of the statistical structure of language. An example is provided of how frequency may relate to grammaticality judgments of nonnative speakers acquiring multiple wh-questions.