In 1979, the Alliance Premier League was formed by a group of leading Southern League and Northern Premier League clubs. The Southern and Northern Premier Leagues became "feeder" leagues to the APL, with automatic promotion and relegation between them. The Isthmian League, while it was now becoming recognised as one of the strongest semi-professional leagues, remained outside the fledgling "pyramid" until 1985. The Southern League also restructured, reducing itself from three divisions to two (running in parallel) to compensate for the loss of many of its Premier Division clubs to the new league.