This Sprint the Product Owner has taken two Sprint Backlog items — a set of content changes — and is working on them herself. The Scrum Master is not working on any Sprint Backlog item. A Developer asks whether the Product Owner should be in the Daily Scrum. What is the accurate answer?

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

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The options

Not correct She attends as a guest and answers questions about priorities, but does not plan the day with the others

Wrong, and it is the tempting answer because it describes what most Product Owners actually do. But someone carrying Sprint Backlog work is planning the Sprint's day like everyone else, not visiting.

Not correct She must not attend, because the Daily Scrum is for the Developers only

Wrong. The event is for the Developers, which is exactly why she is in it — she is doing Developers' work this Sprint. Reading the rule as a ban on people is how candidates lose this item.

Correct She participates in the Daily Scrum as a Developer, because she is actively working on items in the Sprint Backlog

Correct. Scrum ties Daily Scrum participation to the work, not to the job title: whoever is actively working on Sprint Backlog items is a Developer for the purposes of that event.

Not correct Both the Product Owner and the Scrum Master must attend, because all Scrum events involve the whole Scrum Team

Wrong. Sprint Planning, Sprint Review and Sprint Retrospective are whole-team events; the Daily Scrum is not. The Scrum Master here holds no Sprint Backlog item and has no participant's role in it.

Why

This is one of the few places where the Guide names the Product Owner and Scrum Master inside the Developers' event, and the condition is precise — actively working on items in the Sprint Backlog. It follows the mechanism rather than the label: the Daily Scrum is where the people doing the Sprint's work replan their day, so anyone doing that work is in it, and anyone not doing it has no seat regardless of accountability.

Where this comes from

Cited
Scrum Guide section Daily Scrum
What it says
If the Product Owner or Scrum Master are actively working on items in the Sprint Backlog, they participate as Developers.

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