The Joint Declaration on the Doctrine of Justification (1999) constitutes a major achievement in the search for Christian unity, effectively resolving one of the key theological conflicts of the Reformation. Initially an agreement signed by Lutherans and Catholics, it has since been joined and affirmed by three other Christian World Communions, namely the Methodist, Reformed churches and Anglicans.

In 2019, a first consultation between the five Communions on how the Joint Declaration affects their relationship was held in Notre Dame University (USA). The consultation gave rise to the Notre Dame Consultation Statement, a document affirming the substance of the Joint Declaration and recommending ways to deepen institutional relationships between the five Christian Communions. A Steering Committee composed of senior leadership of the five Christian Communions was set up to further promote the Joint Declaration in the life of the communions.