The Tablets of the Divine Plan, by Abdu'l-Bahá are the Charter for the teaching of the Faith.

"As you are no doubt aware, the Tablets of the Divine Plan, which were revealed by Abdu'l-Bahá during the First World War, are the Charter for the teaching of the Faith. All the teaching plans launched by the beloved Guardian, as well as those subsequently directed by the Universal House of Justice, are stages in the implementation of this master plan conceived by the Centre of the Covenant for the diffusion of the Message of Bahá'u'lláh."

(From a letter written on behalf of the Universal House of Justice to an individual believer, September 29, 1977)

http://bahai-library.com/hornby_lights_guidance_2.html&chapter=4#n1628