All-seater stadiums have been compulsory in the English Premiership since the start of the 1994-95 season as a result of the Taylor Report, which gave recommendations to improve stadium safety after the Hillsborough disaster. The initial plan, drawn up in 1990, had recommended that standing areas should be banned from stadiums in the upper two tiers of the league from 1994 onwards, while stadiums in the lower two tiers had until 1999 to meet these requirements. A review of the proposals in 1992 saw non-Premiership and second tier clubs retain the option to have standing areas. From time to time there are calls for Premiership stadiums to be allowed to have standing areas, but these have always been rejected.