Persons undertaking certain functions in relation to CBB specialised licensees require prior CBB approval. These functions (called "controlled functions") include directors and members of senior management. The controlled functions regime supplements the licensing regime by ensuring that key persons involved in the running of specialised licensees are fit and proper. Those authorised by the CBB to undertake controlled functions are called approved persons (see Paragraph AU-A.1.2; Section AU-1.3 for ancillary service providers).