This report describes the activities relating to the preparations for the technical review of information to be reported under the Convention in the third biennial reports and seventh national communications of Parties included in Annex I to the Convention, which were due by 1 January 2018. The activities include the 6^th meeting of lead reviewers and the training of reviewers for the review of biennial reports and national communications. Information on the status of submissions and reviews of the third biennial reports and seventh national communications is contained in document FCCC/SBI/2019/INF.2.