Lineaged Wicca is organised into covens of initiated priests and priestesses. Covens are autonomous and are generally headed by a High Priest and a High Priestess working in partnership, being a couple who have each been through their first, second, and third degrees of initiation. Occasionally the leaders of a coven are only second-degree initiates, in which case they come under the rule of the parent coven. Initiation and training of new priesthood is most often performed within a coven environment, but this is not a necessity, and a few initiated Wiccans are unaffiliated with any coven. Most covens would not admit members under the age of 18. They often do not advertise their existence, and when they do, do so through Pagan magazines. Some organise courses and workshops through which prospective members can come along and be assessed.