Floatability.
The Generic EuRoPax 3000 and the DESSO ROPAX have been superficially studied from this point of view.
The study suggests that the EuRoPax 3000, with the original lifeboat/liferaft arrangement, will arrive at an attained index (A) that may not fully satisfy the required index (R).
With a 100% lifeboat capacity, the required index will be lower and the attained index will, for this reason, be sufficient to meet the required index.