In England and Wales a master is a sworn judge in the High Court having a jurisdiction similar to that of a Justice of the High Court in civil matters within the division of the court to which the master is appointed. The role of a master in the High Court of Justice of England and Wales is concerned primarily with trial and case management of High Court civil claims in London excluding committals to prison, judicial review and criminal cases. There are masters in the Queen's Bench and Chancery Divisions and the Costs Office (Taxing Masters/Costs Judges) and their roles differ slightly.