Catechesis of the Good Shepherd (CGS) is a philosophy of Spiritual Formation that was "born from the joy of the children in their encounter with God and lives in being nourished by this joy."

CGS happens in a carefully prepared environment called an Atrium, where children are invited to interact with specific Biblical works and spiritual materials. The Atrium is a place of prayer, curated for the child with their developmental level in mind, employing pieces of the Montessori educational philosophy.

In the Atrium, children are ushered into God's presence for an experience that is unique to their individual personhood. "Catechesis of the Good Shepherd divests itself of any strictly scholastic character, so as to become an experience of life, an education in faith, and a celebration of the encounter with the Father, in listening to Jesus, the one Teacher, and in obedience to the Holy Spirit."