A Scrum Team on one-month Sprints reaches the eighth hour of Sprint Planning. A Sprint Goal has been agreed and items are selected, but the Developers have detailed the plan for only about half of them. What should happen?

Professional Scrum Master I, objective 2. Developing people and teams medium

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The options

Not correct The event is extended by two hours so the plan can be completed properly

Wrong, and it is the honest-looking answer. But the Scrum Master serves the events by keeping them within the timebox, and a plan whose detail is bought with overrun is a plan nobody will believe by day four.

Not correct The Sprint is delayed by a day so Sprint Planning can reconvene in the morning

Wrong. A new Sprint starts immediately after the previous one concludes, so the day is not free — it is a day of the new Sprint spent without a plan the team is already able to act on.

Not correct The Developers drop the undetailed items from the Sprint Backlog so the plan matches the time available

Wrong. Undetailed is not the same as unselected. Dropping work the team believes it can do, purely because a clock ran out, damages the Sprint Goal rather than the plan.

Correct Sprint Planning ends at the timebox and the Sprint starts; the Developers continue to detail the plan during the Sprint as more becomes known

Correct. The Sprint Backlog is an emergent plan, not a finished document, and a Sprint Goal plus selected items is enough to begin. The timebox is kept and the remaining planning happens inside the Sprint, where the Developers were going to learn most of it anyway.

Why

Sprint Planning has to deliver a Sprint Goal and a selection of items with enough plan to start; it does not have to deliver a complete plan, because the Sprint Backlog is updated throughout the Sprint as more is learned. The exam room version of this rule: timeboxes are never extended, and the question to ask when one is reached is not "are we finished?" but "can the Developers begin?"

Where this comes from

Cited
Scrum Guide section Sprint Planning
What it says
Sprint Planning is timeboxed to a maximum of eight hours for a one-month Sprint.

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