Legitimate reasons
1. Scope grows beyond the register 2. A dependency turns out to be materially different from what was described 3. The date moves in a way that changes how the work must be resourced 4. A third-party cost changes and is passed through at cost
Not legitimate
- We underestimated something we should have caught
- Internal inefficiency on our side
- A tool or licence we chose for our own convenience
How it is communicated
Before the extra work happens, in writing, with the option to decline and keep the original scope.