Language Spoken at Home is a data set published by the United States Census Bureau on languages in the United States. It is based on a three-part language question asked about all household members who are five years old or older. The first part asks if the person speaks a language other than English at home. If the answer is 'yes,' the respondent is asked what that language is. The third part of the question asks how well the person speaks English ("Very well,' "Well," "not well," "Not at all").