In any case, you should notify the sponsor and stakeholders or change- control committee about the deviation. If the deviation is no big deal, simply say, "We ' re handling it," and move on. There will probably be no sponsor/stakeholder approval necessary.
On the other hand, a major change that has gone through revision efforts in the form of time and cost estimates, and that has had a report prepared, must be brought before the sponsor and stakeholders or change-control committee so they can approve the deviation and allow you to go forward.
Be prepared for the folks involved in approving the deviation to thoroughly query you regarding your homework relative to the requested deviation.
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