Active Members begin at the First Degree. They must be approved for an Active Membership, and this is based on their answers to a long list of questions. Members cannot apply for higher Degrees, and the requirements for each degree are not open to the public. Promotion to a higher degree is only by being invited. Members of the Third through Fifth degrees are the Priesthood and may be called "Reverend." Members of the Fifth degree are sometimes called "Doctor," although ""The" Doctor" usually means Lavey. Some Active Members are called Agents, qualified to explain the Church of Satan and the philosophy of Satanism to the media and others who are interested.