Page "Politics of the United Kingdom" Paragraph 67

The Assembly has authority to legislate in a field of competences known as " transferred matters ".

These matters are not explicitly enumerated in the Northern Ireland Act 1998 but instead include any competence not explicitly retained by the Parliament at Westminster.

Powers reserved by Westminster are divided into " excepted matters ", which it retains indefinitely, and " reserved matters ", which may be transferred to the competence of the Northern Ireland Assembly at a future date.

Health, criminal law and education are " transferred " while royal relations are all " excepted ".