"Rules for the Classification of Steel Ships" is composed of 12 parts and "Guidance Relating to the Rules for the Classification of Steel Ships" is composed of 10 parts.

"Other Rules" is composed of 9 kinds and "Other Guidance" is composed of 16 kinds.

2.3 Numbering System

2.3.1 "Rules for the Classification of Steel Ships" and "Guidance Relating to the Rules for the Classification of Steel Ships"