The Society of Christian Doctrine (Latin: Societas Doctrinæ Christianæ, Italian: Società della Dottrina Cristiana, Maltese: Soċjetà Duttrina Nisranija; abbreviated SDC),[3][4] better known as MUSEUM, is a society of Catholic lay volunteers, made of men and women, teaching catechism in the Christian faith formation of children and adults.

[6] It has eventually spread around the world, first among Maltese migrants in Australia, then in Albania, in North Sudan, and other countries.

[7] MUSEUM is the abbreviation for "Magister Utinam Sequatur Evangelium Universus Mundus" as meaning "Master, may the whole world follow the Gospel.

[8] The society often organises recreational activities for minors and educational courses for adults.

[6] The main scope for teaching catechism is to religiously prepare individuals, generally minors, to receive the sacraments according to the Roman Catholic tradition.