Delegates with long memories (and probably more than a few gray hairs) will recall the Article 9 review. Initiated, as the KP requires, at CMP2 in Nairobi, the review failed to achieve much of note. Its second iteration, in Poznan, failed to agree to any further substance. Does anyone even remember whether it led to a third review?
In contrast, the Article 3.9 review led to agreement of commitments for the second commitment period of the Kyoto Protocol, inscribed in Annex B to the KP (as required by the article).