The database contains geographical, organizational and address information on each Catholic diocese in the world, including Eastern Catholic Churches in full communion with the Holy See, such as the Maronite Catholic Church and the Syro-Malabar Church.
It also gives biographical information on current and previous bishops of each diocese, such as dates of birth, ordinations and (when applicable) death.
Among the printed sources used are the Holy See publications: Annuario Pontificio, Acta Apostolicae Sedis and Acta Sanctae Sedis. Historical studies by authors whose surnames range from Andrade to Zúñíga are also utilized.
The Vatican Information Service provides news about changes affecting dioceses and bishops.