This chapter concerns Art. 123(2) and (3) EPC. Other aspects of amendments are dealt with elsewhere; see for example Chapters II.F. "Divisional applications"; II.D.2.1.2 "Priority"; IV.B.1.1, IV.B.2.5, IV.B.3.3, IV.B.3.4, IV.B.3.6, IV.B.3.7, IV.B.5 "Examination procedure"; IV.D.4 "Opposition procedure"; IV.E.4 "Appeal procedure". Readers are also referred to the new Part H of the Guidelines for Examination in the European Patent Office (June 2012 edition), which gives an overall picture of the various principles applicable to amendments (formal admissibility and substantive allowability).