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In corporate governance, a company's articles of association (AoA, called articles of incorporation in some jurisdictions) is a document which, along with the memorandum of association (in cases where it exists) form the company's constitution, and defines the responsibilities of the directors, the kind of business to be undertaken, and the means by which the shareholders exert control over the board of directors. Articles of association are very critical documents to corporate operations, as they may regulate both internal and external affairs.