Dr. Sabine Knapp: Green Award ships perform better

'On average, ships that are certified by Green Award show a lower amount of deficiencies in almost categories versus ships that are not certified'.

This is one of the conclusions of the dissertation Ms Sabine Knapp successfully defended at the Erasmus University in Rotterdam on 25th January 2007. The thesis was called: 'The Econometrics of Maritime Safety -Recommendations to Enhance Safety at Sea'.

Dr. Knapp's thesis should be seen and understood as a first attempt to study Port State Control on a global scale by measuring the effect of inspections on the probability of casualties and by identifying areas for improvement.

The thesis is based on 183.000 Port State Control inspections and 11.000 casualties (globally) from 1999 to 2004. Dr. Knapp researched criteria on which ships are selected for inspection and indicated that further improvements on targeting sub-standard ships can be made. The classic variables such as e.g. age, ship type, size, flag or owner are valid variables, but new variables like the total inspection history of a ship should be added to improve the effectiveness of inspections.

One out of several possibilities for further improvement would be to include if a vessel had been inspected by one of the vetting inspection regimes or certified by the Green Award Foundation.

In the research, data from Green Award was merged with the total dataset. The result can be seen in the figure below. On average, ships that are certified by Green Award show a lower amount of deficiencies in almost all inspection categories.


In the area dealing with safety and fire appliances (code 600 and 700) the difference is significant. The same applies for code 900 (structural safety), code 1200 (load lines), code 1500 (safety of navigation) and code 1700 (Marpol Annex 1: Oil pollution). Also remarkable is the Green Award score for code 2500 (ISM code).

Overall one can conclude that Green Award certified vessels (0.7 deficiencies) show a better performance in Port State Control than non-certified vessels (2.6 deficiencies) and that the incentive to perform better does pay off for the ship owner.

ISBN 90-5892-127-1


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