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In page Common law:

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In a common law jurisdiction, several stages of research and analysis are required to determine "what the law is" in a given situation.[1] First, one must ascertain the facts. Then, one must locate any relevant statutes and cases. Then one must extract the principles, analogies and statements by various courts of what they consider important to determine how the next court is likely to rule on the facts of the present case. More recent decisions, and decisions of higher courts or legislatures carry more weight than earlier cases and those of lower courts.[2] Finally, one integrates all the lines drawn and reasons given, and determines "what the law is".[citation needed] Then, one applies that law to the facts.[citation needed]