Show your change control process: document the request, assess impact on timeline and budget, present options to stakeholders, and get sign-off before proceeding.
Look for: clear scope definition upfront, change request processes, impact assessment before accepting changes, transparent communication with stakeholders about trade-offs (scope vs time vs budget), and ability to push back diplomatically. Strong candidates show that controlled scope changes can be positive when managed properly.
Core PM skill. Candidates who never push back on scope are not managing; candidates who always block changes are not serving stakeholders. Look for the balanced approach.