Prior to the introduction of the world rankings, the previous year's winner and runner-up were allocated the top seedings in the World Championship, held annually. As more tournaments were added to the calendar and more players joined the circuit in the 1970s, it became increasingly necessary to seed the tournaments, precipitating the "Order of Merit" for the
1975–76 season. The system was very basic, with seedings based on the results of the last three World Championships with the winner awarded five points, the runner-up four, semi-finalists three, and so on down to one point for players who lost in the last 16. The world rankings, introduced in the following year, used the same allocation. Subsequent tournaments that were assigned ranking status worked on the same system but with the World Championship from 1983 onwards carrying double points. The ranking point allocation was later revised slightly with winners of all bar the World Champion receiving six points, runners-up five, down to one point for the last 32; the World Championship more or less stayed as it was with ten points for the winner, incrementally reduced by two points for each preceding round, but now awarded one point for the last 32 in line with the other tournaments. In addition to ranking points, merit and frame points were also awarded which were used as a tie-break when players were on equal ranking points. By the
1982–83 season many more tournaments were being contested, and it seemed reasonable to take those results into consideration too. The
Professional Players Tournament and
International Open were awarded ranking status, working on the same system; the
Classic carried ranking points from the
1983–84 season, the
UK Championship and
British Open from
1984–85. The revised system was now based on only the two previous seasons, and updated annually after the World Championship. == Season rankings ==