Introduction The year 2018 edition of the Rules for Building and Classing High-Speed Naval Craft consists of the eight (8) booklets as shown in Table 1. With regard to three booklets@ Part 1@ Part 2@ and Part 7: a) The purpose of the generic title ABS Rules for Conditions of Classification ?C High-Speed Craft (Part 1) is to reflect the expanded contents of PART 1@ as a result of including consolidated requirements for ??Classification?? applicable to all types of and sizes of highspeed craft as specified in the Foreword to Part 1. Additional specific requirements are contained in Chapters 2 and 3 of Part 1. b) The purpose of the generic title ABS Rules for Materials and Welding of PART 2 is to emphasize the common applicability of the requirements to ABS-classed vessels@ other marine structures and their associated machinery@ and thereby make PART 2 more readily a common ??PART?? of various ABS Rules and Guides@ as appropriate. c) The purpose of the generic title ABS Rules for Survey After Construction (Part 7) is to reflect the expanded contents of PART 7@ as a result of including consolidated requirements for ??Surveys After Construction?? applicable to all types and sizes of vessels@ barges and specific shipboard arrangements/systems@ etc.@ as specified in Part 7@ Chapter 1@ Section 1. The numbering system applied in the Rules is shown in Table 2. The primary changes from the 2017 Rules are identified and listed in Table 3. The effective date of the indicated Rule Changes is 1 January 2017@ unless specifically indicated otherwise. The effective date of each technical change since 1993 is shown in parenthesis at the end of the subsection/paragraph titles within the text of each Part. Unless a particular date and month are shown@ the years in parentheses refer to the following effective dates: Until the next edition of the Rules for Building and Classing High-Speed Naval Craft is published@ Rule Change Notices and/or Corrigenda@ as necessary@ will be published on the ABS website ?C www.eagle.org ?C only@ and will be available free for downloading. It is not intended to publish hard copies of future Rule Change Notices and/or Corrigenda to existing Rules or Guides. The consolidated edition of the Rules for Building and Classing High-Speed Naval Craft@ which includes Rule Change Notices and/or Corrigenda using different colors for easy recognition@ will be published on the ABS website only when RCN and/or Corrigenda are issued. The listing of CLASSIFICATION SYMBOLS AND NOTATIONS is available from the ABS website www.eagle.org for download.