A governing document is the document that your organisation has signed in accordance with the legal structure your organisation has chosen. The exception to this definition is that of charitable incorporated organisations which are not signed because they do not exist until they are registered with the Charity Commission!
What the governing document includes and what is known as depends on the legal structure - your organisation will only have one governing document!
|Company Limited by Guarantee||Memorandum and Articles of Association|
|Charitable Incorporated Organisation (CIO)||Constitution|
|Community Interest Company (CIC)||Memorandum and Articles of Association|
For more information about each of the legal structures and links to model governing documents see the Choosing a legal structure section.