May 9

As to whether the materials prepared by the Research Department constitute the authoritative word of the Universal House of Justice on a particular subject, as raised in your third question, the House of Justice indicates that such materials, though prepared at its direction, represent the views of that Department. While such views are very useful as an aid to resolving perplexities or gaining an enhanced understanding of the Bahá'í Teachings, they should never be taken to be in the same category as the elucidations and clarifications provided by the Universal House of Justice in the exercise of its assigned functions. However, the House of Justice chooses to convey the materials prepared by the Research Department to the friends because it wishes them to be thoughtfully attended to and seriously considered. 
(From a letter dated 22 October, 1996, written on behalf of the Universal House of Justice to an individual believer)