This document discusses principles of statutory interpretation used by judges to interpret legislation. It explains that statutory interpretation is necessary when a statute contains ambiguous or vague aspects. It outlines several primary and secondary rules of interpretation used by judges, including the literal rule, mischief rule, golden rule, rule of harmonious construction, noscitur a sociis, and ejusdem generis. The literal rule involves interpreting statutes based on the ordinary meaning of the words, while the mischief rule and golden rule allow judges to consider legislative intent to prevent absurd or irrational outcomes.