The two main political parties in the agreement were the Ulster Unionist Party (UUP), led by David Trimble, and the Social Democratic and Labour Party (SDLP), led by John Hume. The two heads of state and government together won the Nobel Peace Prize in 1998. The other parties to the agreement were Sinn Féin, the Alliance Party and the Progressive Unionist Party. The Democratic Unionist Party (DUP), which later became the largest Unionist party, did not support the agreement. When Sinn Féin and loyalist parties entered, they left the talks because republican and loyalist paramilitary weapons had not been decommissioned. “If you build a large, politically controversial physical infrastructure on a border, you focus on the context and causes of the conflict,” he said. Former British Prime Minister John Major has argued that Brexit could lead to a hard border, with the European Union and the UK having to control their borders for customs purposes.  The Conservative Party research group believes that the UK may have the choice of not controlling its border if VAT is not imposed or controlling the border to apply possible VAT on goods imported after Brexit.   The multi-party agreement required the parties to use “any influence they might have” to obtain the dismantling of all paramilitary weapons within two years of the referendums approving the agreement.
The standardization process has forced the British government to reduce the number and role of its armed forces in Northern Ireland “to a level compatible with a normal peaceful society.” These include the elimination of security measures and the abolition of special emergency powers in Northern Ireland. The Irish government has pledged to conduct a “thorough review” of its violations of national law. According to the agreement, “the development of a peaceful environment… A standardization of security measures and practices can and should mean. The agreement was reached between the British and Irish governments as well as eight northern Ireland political parties or groups. Three were representative of unionism: the Ulster Unionist Party, which had led unionism in Ulster since the early 20th century, and two small parties linked to loyalist paramilitaries, the Progressive Unionist Party (linked to the Ulster Volunteer Force (UVF) and the Ulster Democratic Party (the political wing of the Ulster Defence Association (UDA). Two of them have been widely described as nationalists: the Social Democratic and Labour Party and Sinn Féin, the Republican party affiliated with the Provisional Republican Army.   Apart from these rival traditions, there were two other assemblies, the Inter-Community Alliance Party and the Northern Ireland Women`s Coalition.