The Mind Sport of Memory is both a fun and valuable hobby, as well as being an amateur sport. At the fun end of memory, informal competitions take place in Brain Clubs and in other Mind Sport groups taking many different forms. At a more competitive level, there are specific disciplines which were created in 1991 by the founders of the sport, Tony Buzan and Raymond Keene OBE, and which lay down a common competition framework that has enabled international competition to take place. Competitions that comply with the WMSC rules standards can be included in the World Rankings. The World Memory Championships take place annually are seen as the most comprehensive test of memory in the world.