The Racing Rules of Sailing (RRS) governs the sport of sailboat and sailboard racing. It is revised and published every four years by World Sailing. The current edition is the RRS 2025-2028.

The Equipment Rules of Sailing govern the equipment used in the sport; the rules are revised and published every four years by World Sailing.

The Case Book for 2025-2028 follows a complete review of all the cases previously published and includes all new cases adopted so far by World Sailing since 2021. Many cases have been rewritten, some only slightly but others extensively, to illustrate as clearly as possible the application of the 2025-2028 racing rules; a few cases were temporary withdrawn for revision, and they will be either permanently deleted or released in the near future.