 Judgments may interpret statutes or subsidiary legislation, or develop principles of common law and equity laid down, not by the legislature, but by previous generations of judges.Major portions of Singapore law, particularly contract law, equity and trust law, property law and tort law, are largely judge-made, though certain aspects have now been modified to some extent by statutes.A custom is an established practice or course of behaviour that is regarded by the persons engaged in the practice as law.