In construction contract administration the general purpose of a notice is to document the anticipated expansion or contraction of the scope of work of a project. Notices can be used to elicit a quote from the contractor, and should contain language that explicitly forbids or permits the contractor to proceed with any work described therein without subsequent written authorization in the form of an approved Order.

Notices go by a variety of names, including: Change Notice, Contemplated Change Order, Proposed Change, Change Directive, and Bulletin. Despite the diverse nomenclature, there are three commonly issued types of Notices: