Statutory interpretation is the process of interpreting an applying legislation. Some amount of interpretation is always necessary when a case involves a statute. Sometimes the words of a statute have a plain and straightforward meaning. But in most cases, there is some ambiguity or vagueness in the words of the statute that must be resolved by the judge. To find the meanings of statutes, judges use various tools and methods of statutory interpretation, including traditional canons of statutory interpretation, legislative history, and purpose.