Your question is Phased Rollout for Internal Tool. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Walk me through your process for managing a phased rollout of a new internal tool.
Explain how you would structure the rollout, align stakeholders, define readiness criteria, manage risks, collect user feedback, and decide whether to proceed, pause, or roll back between phases. Include the deliverables, metrics, and communication mechanisms you would use.