 Though an infrequent occurrence, during its history WWE has worked with other wrestling promotions in collaborative efforts.During the 1970s, 1980s, and early 1990s, WWE had working relationships with the Japanese New Japan Pro-Wrestling (NJPW), Universal Wrestling Federation (UWF), Universal Lucha Libre (FULL), and the Mexican Universal Wrestling Association (UWA).These working relationships led to the creations of the WWF World Martial Arts, Light Heavyweight and Intercontinental Tag Team championships.