During Sprint Planning, a solution architect who is not on the Scrum Team hands the Developers a task breakdown for each selected Product Backlog item and asks them to follow it. The Developers had planned to decompose the work differently. What does Scrum say about this?

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

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The options

Not correct The breakdown stands, because architecture decisions sit above the Scrum Team

Wrong. Scrum places no architectural authority above the Developers. An architect can advise, and often should, but advice that cannot be declined is an instruction.

Not correct The Product Owner decides which breakdown to adopt, since they own what is delivered

Wrong. The Product Owner owns why the Sprint is valuable and which items are candidates; the plan for turning those items into an Increment is not theirs to choose.

Not correct The architect may not attend Sprint Planning at all, as it is an event for the Scrum Team

Wrong, and it overcorrects. The Scrum Team may invite other people to Sprint Planning to provide advice. The problem is not the architect's presence, it is the instruction.

Correct The Developers decide how the work gets done; the architect's breakdown is advice they may take or leave

Correct. How selected items become Increments is at the sole discretion of the Developers, which is what makes an outsider's plan an input rather than a decision.

Why

Sprint Planning splits the decisions cleanly: the Product Owner proposes value, the whole Scrum Team shapes the Sprint Goal, the Developers select the items through discussion with the Product Owner, and then the Developers alone plan the how. That last boundary is the one PSM I probes, usually by putting a plausible expert in the room. Expertise is welcome; the decision still belongs to the people doing the work.

Where this comes from

Cited
Scrum Guide section Topic Three: How will the chosen work get done?
What it says
How this is done is at the sole discretion of the Developers. No one else tells them how to turn Product Backlog items into Increments of value.

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