Question: What agreement is the devolved government of Northern Ireland, which Mervyn Storey was part of, famous for establishing?

Context paragraphs:
Governance of England: There has not been a government of England since 1707 when the Kingdom of England ceased to exist as a sovereign state, as it merged with the Kingdom of Scotland to form the Kingdom of Great Britain.  Kingdom of Great Britain continued from 1707 until 1801 when it merged with the Kingdom of Ireland to form the United Kingdom of Great Britain and Ireland, which itself became the United Kingdom of Great Britain and Northern Ireland (UK) in 1922 (in reality; in name in 1927) upon independence for most of the island of Ireland.  The UK since then has gone through significant change to its system of government, with devolved parliaments, assemblies and governments in Scotland, Wales and Northern Ireland.  England, however, remains under the full jurisdiction, on all matters, of the Parliament of the United Kingdom of Great Britain and Northern Ireland and the UK government as no devolved administration has been created for England within the new structure.  This situation has led to the anomaly, known as the West Lothian question, which is that Scottish Members of Parliament (MPs) are able to vote on legislation that affects only England whereas English MPs can not vote on certain Scottish matters due to devolution.  In some cases, such as top-up university tuition fees and foundation hospitals, the votes of Scottish MPs have been crucial in helping pass legislation for England that the majority of English MPs have opposed.

Northern Ireland Executive: The Northern Ireland Executive is the devolved government of Northern Ireland, an administrative branch of the legislature Northern Ireland Assembly.  It is answerable to the Assembly and was established according to the terms of the Northern Ireland Act 1998, which followed the Good Friday Agreement (or Belfast Agreement).  The executive is referred to in the legislation as the Executive Committee of the Assembly and is an example of a consociationalist government.

Executive of the 1974 Northern Ireland Assembly: A power-sharing Northern Ireland Executive was formed following the Northern Ireland Assembly elections of 1973.  The executive served as the devolved government of Northern Ireland from 1 January 1974 until its collapse on 28 May 1974.

Good Friday Agreement: The Good Friday Agreement (GFA) or Belfast Agreement (Irish: "Comhaontú Aoine an Chéasta" or "Comhaontú Bhéal Feirste"; Ulster-Scots: "Guid Friday Greeance" or "Bilfawst Greeance") was a major political development in the Northern Ireland peace process of the 1990s.  Northern Ireland's present devolved system of government is based on the agreement.  The agreement also created a number of institutions between Northern Ireland and the Republic of Ireland, and between the Republic of Ireland and the United Kingdom.

Anglo-Irish Agreement: The Anglo-Irish Agreement was a 1985 treaty between the United Kingdom and Ireland which aimed to help bring an end to the Troubles in Northern Ireland.  The treaty gave the Irish government an advisory role in Northern Ireland's government while confirming that there would be no change in the constitutional position of Northern Ireland unless a majority of its people agreed to join the Republic.  It also set out conditions for the establishment of a devolved consensus government in the region.

Northern Ireland Assembly (1973): The Northern Ireland Assembly was a legislative assembly set up by the Government of the United Kingdom on 3 May 1973 to restore devolved government to Northern Ireland with the power-sharing Northern Ireland Executive made up of unionists and nationalists.  It was abolished by the Northern Ireland Act 1974.

Mervyn Storey: Mervyn Storey (born 4 September 1964) is a Northern Ireland politician and a Democratic Unionist Party MLA for North Antrim.  Storey was Minister for Social Development in the Northern Ireland Executive (2014–16), and in 2016 was appointed Minister for Finance & Personnel.

Northern Ireland Civil Service: The Northern Ireland Civil Service (NICS; Irish: "Státseirbhís Thuaisceart Éireann" ; Ulster-Scots: "Norlin Airlann Cïvil Sarvice") is the permanent bureaucracy of employees that supports the Northern Ireland Executive, the devolved government of Northern Ireland.

Northern Ireland: Northern Ireland (Irish: "Tuaisceart Éireann" ] ; Ulster-Scots: "Norlin Airlann ") is a part of the United Kingdom in the north-east of the island of Ireland, variously described as a country, province or region.  Northern Ireland shares a border to the south and west with the Republic of Ireland.  In 2011, its population was 1,810,863, constituting about 30% of the island's total population and about 3% of the UK's population.  Established by the Northern Ireland Act 1998 as part of the Good Friday Agreement, the Northern Ireland Assembly holds responsibility for a range of devolved policy matters, while other areas are reserved for the British government.  Northern Ireland co-operates with the Republic of Ireland in some areas, and the Agreement granted the Republic the ability to "put forward views and proposals" with "determined efforts to resolve disagreements between the two governments".

Politics of Northern Ireland: Since 1998, Northern Ireland has devolved government within the United Kingdom.  The government and Parliament of the United Kingdom are responsible for reserved and excepted matters.  Reserved matters are a list of policy area (such as civil aviation, units of measurement, and human genetics), which the Westminster Parliament may devolve to the Northern Ireland Assembly at some time in future.  Excepted matters (such as international relations, taxation and elections) are never expected to be considered for devolution.  On all other matters, the Northern Ireland Executive together with the 108-member Northern Ireland Assembly may legislate and govern for Northern Ireland.  Additionally, devolution in Northern Ireland is dependent upon participation by members of the Northern Ireland Executive in the North/South Ministerial Council, which co-ordinates areas of co-operation (such as agriculture, education and health) between Northern Ireland and the Republic of Ireland.

Supporting paragraphs: Mervyn Storey Northern Ireland Executive
Answer: Good Friday Agreement