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In order to understand the many different aspects of law it is helpful to look at the various areas or classifications of law. There are many legal principles or rules of law that are found in statutes, cases decided by courts, and other sources that are applied by the courts in order to decide lawsuits, and these rules or principles of law are classified as substantive law. On the other hand, the legal procedures that provide how a lawsuit is begun, how the trial is conducted, how appeals are taken, and how a judgment is enforced are called procedural law. In other words, substantive law is that part of the law that defines rights, and procedural law establishes the procedures whereby rights are enforced and protected. For example, A and B have entered into an agreement, and A claims that В has breached the agreement. The rules that provide for bringing В into court and for the conduct of the trial are rather mechanical and they constitute procedural law. Whether the agreement was enforceable and whether A is entitled to, damages are matters of substance and would be determined on the basis of the substantive law of contracts.