The most significant changes that have been introduced concern: the required content of Notices of Appeal (see the new version of Rule 20(2)(d) and Rule 23(2)); a new, earlier deadline for filing an appellant's submission (7 days, rather than 10 days after the filing of the Notice of Appeal, see the amendments to Rule 21); a new requirement for parties wishing to file an other appeal to file a Notice of Other Appeal within 12 days of the Notice of Appeal (see Rule 23); the introduction of the possibility to amend a Notice of Appeal or Notice of Other Appeal (see new Rule 23bis); and modification of the deadline for requesting authorization to correct clerical errors in written submissions (within 30 days of the filing of the Notice of Appeal rather than within 3 days of the filing of the relevant submission, see the new version of Rule 18(5)).

A full explanation of all the changes that have been made, as well as the rationale for such changes, are set out in WTO Document WT/AB/WP/W/9.