In most respects, the exceptions and final provisions of the Trans-Pacific Partnership (TPP) do not depart significantly from earlier practice by the United States and many of the other Parties; the summaries of Chapters 1 and 27 are therefore very brief. The exceptions are summarized at somewhat greater length in Section 3 below. The most significant are the Chapter 30 final provisions, particularly those discussed in Section 4 below. The first such change relates to the complex provisions that governed entry into force for the original TPP, which effectively required both the United States and Japan to become Parties to the TPP for the agreement to become effective. The second relates to accession by other nations, with the modifications made under the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP) after U.S. withdrawal.