lists are available from 1934. However the PGA Tour itself dates the formal establishment of the Tour to 1968, when the "Tournament Players Division" split from the PGA of America. Similarly, the European Tour officially began in 1972, although it evolved from the British PGA circuit which merged with the Continental European circuit in 1977 before fully separating from the PGA in 1984. The dates of establishment of the other key tours include: LPGA Tour (1950); Sunshine Tour (1971), Japan Golf Tour (1973); PGA Tour of Australasia (1973), Asian Tour (1995). The Asian Tour was preceded by the Asia Golf Circuit, which operated from 1962 until 1999. The term "circuit" is often used to describe groups of professional golf tournaments, either organised tours, which may or may not include "unofficial" events, or simply to broadly categorize events in a local area or wider region. As professional golf has continued to expand developmental tours such as the Challenge Tour (1986) and the Web.com Tour (1990; originally called the Ben Hogan Tour and later the Korn Ferry Tour) and senior tours such as PGA Tour Champions (1980; originally the Senior PGA Tour and later the Champions Tour) and the Legends Tour (1992; originally the European Senior Tour) have been established to give more golfers the opportunity to play on a tour, and to take advantage of the willingness of sponsors and broadcasters to fund an ever-increasing number of tournaments. Structure of tour golf There are more than twenty professional golf tours, each run by a Professional Golfers Association or an independent tour organisation which is responsible for arranging events, finding sponsors, and regulating the tour. Most of the major tours are player controlled organisations whose commercial objective is to maximise the income of their members by maximising prize money. The larger tours have a tournament almost every week through most of the year. Each tour has "members" who have earned their "tour cards", meaning they are entitled to play in most of the tour's events. A golfer can become a member of a leading tour by succeeding in an entry tournament, usually called a Qualifying School ("Q-School"); or, by achieving a designated level of success in its tournaments when competing as an invited non-member; or, much rarer, by having enough notable achievements on other tours to make them a desirable member. Membership of some of the lesser tours is open to any