The application of intact stability Weather Criterion to the new large passenger ships leads to more stringent requirements than the application of current subdivision and stability rules for damage ships. A critical analysis of Weather Criterion in its hystorical development and in the present version is thus conducted. This is aimed at an adjustement of the calculation formulas of relevant quantities and to the introduction of the possibility of their direct measurement through scale model tests or eventually of a direct proof of the satisfaction of the Weather Criterion as a whole.
