Uvulo-palato-pharyngo-plasty (UPPP) was introduced as a method of treatment of obstructive sleep apnoea in 1980. The pathogenesis of obstructive sleep apnoea is described. The operative technique is also described and illustrative case histories are quoted. The effect obtained varies and, for this reason, the role of UPPP in the treatment of obstructive sleep apnoea cannot be finally established.