Work is in progress at IMO-SLF on the development of so called "Second Generation Intact Stability Criteria". This development is expected to be embedded in a three-plus-one-tiers framework comprising vulnerability criteria of level 1 and 2, direct stability assessment and operational guidance. This paper presents two procedures for addressing parametric roll at a vulnerability level 1 and the dead-ship condition at a vulnerability level 2. In the context of development of suitable models to be implemented in a regulatory framework, proper attention will be given to the concept of "validation", which seems to be sometime misunderstood in the rule making process.
