Protestantism:

In 1999, the representatives of Lutheran World Federation and Catholic Church signed the Joint Declaration on the Doctrine of Justification, apparently resolving the conflict over the nature of justification which was at the root of the Protestant Reformation, although Confessional Lutherans reject this statement. This is understandable, since there is no compelling authority within them. On 18 July 2006, delegates to the World Methodist Conference voted unanimously to adopt the Joint Declaration.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". What two groups originally signed the Joint Declaration?
Lutheran World Federation and Catholic Church