This chapter deals with procedural matters and formal requirements relating to the admissibility of amendments. An important requirement dealt with is the applicant's obligation to identify amendments and indicate the basis for them in the application as filed (Rule 137(4); for transitional provisions, see H‑III, 2.1.4). The chapter also deals with the format of and procedure for making amendments, as well as issues relating to auxiliary requests and how to deal with different texts for different contracting states.