During the last 10–15 years the industry has put significant focus on fatigue analysis methodologies for offshore ships. The reason for this is a larger cost consequence associated with fatigue cracks in these ships compared to traditional tankers. During these years DNV has gained experience from classification of offshore ships, experience from a number of detailed fatigue analyses of ships and FPSO’s and recommendations achieved through the joint industry project: “Fatigue Capacity of FPSOs”. Based on this DNV has found it appropriate to develop a Recommended Practice (DNV-RP-C206) for fatigue design of floating production, storage and offloading units and to link this document to classification services offered by DNV. The methodology can also be applied to other types of offshore ships. Some of the background and content of this Recommended Practice is presented in this paper.Copyright © 2006 by ASME