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In page Convention (norm):

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In government, convention is a set of unwritten rules that participants in the government must follow. These rules can be ignored only if justification is clear, or can be provided. Otherwise, consequences follow. Consequences may include ignoring some other convention that has until now been followed. According to the traditional doctrine (Dicey)[citation needed], conventions cannot be enforced in courts, because they are non-legal sets of rules. Convention is particularly important in the Westminster System of government, where many of the rules are unwritten.