Half of the upcoming Sprint's candidate items touch a payments integration nobody on the team has used. The Developers want the company's integration specialist, who is not on the Scrum Team, in the room for Sprint Planning. Is that allowed, and on what terms?

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

Machine-checked — no person has signed for it. This question was read against the source cited below by an automated pass, which found no contradiction. That is a weaker claim than it sounds: the same kind of process wrote the question, so it can confirm its own mistake.

Treat it as a good draft rather than as settled fact, and read the source below before you rely on it. It is not used in mock exams here — only questions a person has signed for are.

The options

Not correct Yes, and because he has the expertise he should decide how many payment items the Sprint can hold

Wrong, and it is the trap in this item. Advice is welcome; the forecast is not his. Selecting how much can be done is the Developers' call, informed by their past performance, capacity and Definition of Done.

Correct Yes — the Scrum Team may invite other people to Sprint Planning to provide advice, and the specialist advises while the Developers still select the work

Correct. Scrum explicitly permits invited advisers at Sprint Planning. What does not change is who decides: the Developers select the items and plan how the work gets done.

Not correct No — Sprint Planning is attended only by the Scrum Team, so the Developers must consult him beforehand

Wrong. Consulting him first is a reasonable idea and the ban is invented; the Guide allows the Scrum Team to invite others to attend for advice.

Not correct No, unless the Scrum Master approves the guest and briefs him on Scrum first

Wrong. There is no Scrum Master approval step anywhere in Scrum. The invitation is the Scrum Team's to issue.

Why

Attendance and authority are separate questions, and PSM I loves the gap between them. Sprint Planning may include invited people who provide advice, and their presence changes nothing about ownership: the Product Owner proposes the value, the whole Scrum Team crafts the Sprint Goal, the Developers select the items and decide how the work gets done. When an option lets an outsider decide any of those, it is wrong however sensible the person sounds.

Where this comes from

Cited
Scrum Guide section Sprint Planning
What it says
The Scrum Team may also invite other people to attend Sprint Planning to provide advice.

Practise this

Reading one question is not practice. The trainer will draw a set from objective 2 and space the ones you get wrong.

Practise Professional Scrum Master I

More questions on this objective

All questions on Developing people and teams