<P> The agreement was approved by voters across the island of Ireland in two referendums held on 22 May 1998 . In Northern Ireland, voters were asked in the Northern Ireland Good Friday Agreement referendum, 1998 whether they supported the multi-party agreement . In the Republic of Ireland, voters were asked whether they would allow the state to sign the agreement and allow necessary constitutional changes (Nineteenth Amendment of the Constitution of Ireland) to facilitate it . The people of both jurisdictions needed to approve the agreement in order to give effect to it . </P> <P> The British - Irish Agreement came into force on 2 December 1999 . The Democratic Unionist Party (DUP) was the only major political group in Northern Ireland to oppose the Good Friday Agreement . </P> <P> The agreement was made between the British and Irish governments and eight political parties or groupings from Northern Ireland: the Ulster Unionist Party, the Social Democratic and Labour Party, Sinn Féin, the Alliance Party, the Progressive Unionist Party, the Northern Ireland Women's Coalition, the Ulster Democratic Party and Labour . </P> <P> The agreement comprises two elements: </P>

Who was involved in the good friday agreement
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