The government of the Church is vested in Session (The Church's Ministers and elected elders) at the local level, Presbytery at the Wellington level and General Assembly at the National Level.  The General Assembly is the highest of these three courts and meets once a year.

St John's also has a Council, which consists of the leaders of various church committees, including Finance, Communications and Christian Education, as well as Session representatives, the Minister and Chair of the St John's Women's Association.  Much of the day to day administrative business is carried out by the Council, including the functions of the Board of Mangers found in some other Presbyterian Churches.  A large number of other St John's members contribute to the work of the Church through its various committees.

St John's in the City is part of the Presbyterian Church of Aotearoa New Zealand, whose web site gives much more details about Church Government matters.  It also gives brief details on basic Church beliefs and other activities of the national church.  Here's the link to the national church web site:

Presbyterian Church of Aotearoa New Zealand

The Wellington Presbytery meets monthly and gathers for business and fellowship at different churches throughout the region to resource faith communities for mission.  Ministers and Presbytery Elders from St John’s in the City take seriously the responsibilities of being part of a National church, with the need to maintain and foster links to the wider church.