Change order,

Definition of Change order:

1. Unilateral written order by a project owner directing the contractor to change contract amount, requirements, or time. Such changes must be within the scope of the contract and in accordance with the contracts Changes clause to be legally implemented without the consent of the contractor. Also called modification order. See also constructive change.

How to use Change order in a sentence?

1. You need to file for a change order if you need to make some big changes to an already existing contract.
2. We received a change order in the mail, so we had to change everything we did so far and start anew.
3. You should file a change order if you do not like the way something is being handled and need for it to be done differently.