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In common law systems, the Ratio Decidendi is “the rule of law on which a judicial decision is based.” – Oxford

This site is a work-in-progress made possible by Compass.law and the non-profit Legal Innovation Data Institute.


Site content was created by Maritime Law Book and previously appeared in national and regional published case law reports between 1970 and 2016. Copyright in the materials is currently held by Compass.law (successor to Maritime Law Book), and is provided here to support access and understanding of the law for personal, research, educational and journalistic purposes.

The law is complex, and topic-based discovery of legal principles as offered through this site can help. This site is a “proof-of-concept” and intended as a step towards improving access to justice. Compass and LIDI welcome feedback and would also like to hear from potential collaborators interested in running their own experiments with this and similar data in the LIDI Data Trust.

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