What are major IMO amendments with their Date of enforcement?

The amendments, which have been intensively developed over the past decade, are based on the “probabilistic” method of determining damage stability, which is itself based on the detailed study of data collected by IMO relating to collisions. Because it is based on statistical evidence concerning what actually happens when ships collide, the probabilistic concept is believed to be far more realistic than the previously-used “deterministic” method.

The revision has taken into account the results of the HARDER (Harmonisation of Rules and Design Rational) research project: a project undertaken by a consortium of European industrial, research and academic institutions to study the probabilistic approach for assessing a ship’s damage stability and to develop new criteria and indexes for subdivision based on probability of survival, taking into account effects from waves, heeling moments, cargo shift, transient effects and equalization arrangements.