Addendum is the document that notifies contractors of changes before a bid is due, while Supplements and Instructions serve different purposes.
Addendum is the document that notifies the contractor of changes to a bid package before it is due. It is an official modification to the original bidding documents providing additional information or clarifications.
Supplements can also contain supplementary information but are generally not used to notify contractors of changes to bid packages.
Instructions may provide guidance on how to interpret the bid package but do not serve as official notifications of changes.
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