Contains case studies based on risk evaluation of CBM implementation Press Release – Leading Classification Society ClassNK released its CBM Guidelines (Edition 2.0) that explain the revised rules for using Condition Based Maintenance (CBM) in class surveys to promote the use of CBM technology. From safe operation and operational cost reduction perspectives, Condition Based Maintenance (CBM) has been attracting more attention. Under such circumstances, ClassNK amended its CBM rules in 2020 specifying requirements for incorporating modern CBM in surveys. ClassNK also published its CBM Guidelines (First Edition) in 2019, which clarify required documents and the approval procedure for substituting CBM in place of periodical overhaul inspection for class maintenance surveys.