Start with the plan. List the tasks that depend on the changed part.
How it flows
Add the extra time for redesign, new material and re-making. Check supplier lead times too.
Tell the customer the new date and the cause in writing. A written notice helps you resist a late delivery claim, but it does not remove one.
Update the plan every time a change is approved, so the date you quote is always current.
Compare the change with the production plan. If it touches a task on the critical path, the delivery date moves. If the task has float, it may not.
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