He was chosen to represent unmodified Esperanto before the Committee of the Delegation for the Adoption of an International Auxiliary Language, attending the meetings of the Delegation Committee in October, 1907. While ostensibly representing Esperanto before the Committee, he was secretly secondary author after Louis Couturat of the original Ido project which impressed the Delegation Committee and led to the reform of Esperanto by the Committee's Permanent Commission. Letters that are kept in the Department of Planned Languages and Esperanto Museum in Vienna show that he denied any co-authorship of Ido. Beaufront remained a proponent of Ido thereafter, and wrote the influential Ido grammar Kompleta Gramatiko Detaloza, published in 1925.
