The basic unit of the United Church of Christ is the "local church" (also often called the "congregation"). Local churches have the freedom to govern themselves, establishing their own internal organizational structures and theological positions. Thus, local church governance varies widely throughout the denomination. Some congregations, mainly of Congregational or Christian Connection origin, have numerous relatively independent "boards" that oversee different aspects of church life, with annual or more frequent meetings (often conducted after a worship service on a Sunday afternoon) of the entire congregation to elect officers, approve budgets and set congregational policy. Other churches, mainly of Evangelical and Reformed descent, have one central "church council" or "consistory" that handles most or all affairs in a manner somewhat akin to a Presbyterian session, while still holding an annual congregational meeting for the purpose of electing officers and/or ratifying annual budgets. Still others, usually those congregations started after the 1957 merger, have structures incorporating aspects of both, or other alternative organizational structures entirely.