History of Wicca Book of Shadows, adding further degrees of initiation which were required before members could found their own covens. Interest outstripped the ability of the mostly British-based covens to train and propagate members; the beliefs of the religion spread faster by the printed word or word of mouth than the initiatory system was prepared to handle. Also in the 1960s, non-Gardnerian forms of Witchcraft (which are sometimes viewed as Wicca, or sometimes as "Traditional Witchcraft") made their way to the USA. The American Joseph Bearwalker Wilson corresponded with the English Robert Cochrane prior to Cochrane's ritual suicide in 1966, and from
Wicca oral teachings passed along to their initiates. There are many variations on the core structure, and the religion grows and evolves over time. It is divided into a number of diverse lineages, sects and denominations, referred to as "traditions", each with its own organisational structure and level of centralisation. Due to its decentralized nature, there is some disagreement over what actually constitutes Wicca. Some traditions, collectively referred to as British Traditional Wicca, strictly follow the initiatory lineage of Gardner and consider the term "Wicca" to apply only to similar traditions, but not to newer, eclectic traditions. Wicca is typically duotheistic,