On a Wednesday in the middle of a Sprint, outside any scheduled Scrum event, a Product Owner and three Developers spend forty minutes on a single large Product Backlog item, ending with it replaced by four smaller items, each with a clearer description and a size. What have they been doing, in the Guide's terms?

Professional Scrum Master I, objective 3. Managing products with agility easy

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The options

Not correct Sprint Planning, since selecting and decomposing work for a Sprint is what Sprint Planning is for

Wrong. Sprint Planning decomposes selected items into a plan for one Sprint and produces a Sprint Goal; nothing here is bound to a Sprint or to a Goal.

Correct Product Backlog refinement — breaking down and further defining items into smaller, more precise items

Correct. That is the Guide's own definition of refinement, and adding detail such as a description, order and size is exactly what it describes the activity as doing.

Not correct Producing the Sprint Backlog, because a decomposed item with a size is what the Sprint Backlog holds

Wrong. The Sprint Backlog is the Sprint Goal, the items selected for this Sprint and the plan for delivering them — it is a plan by and for the Developers, not a state a backlog item reaches.

Not correct Defining the Product Goal, since clarifying what the items mean is how the Goal is expressed

Wrong. The Product Goal is the long-term objective the rest of the backlog emerges to fulfil, not a summary of newly split items.

Why

Refinement is one activity with one purpose: make items small and precise enough that the Developers can be confident about doing them within a Sprint. The detail it adds — description, order, size — is a means to that end, and the attributes themselves vary with the domain. Recognise refinement by what it produces, because the exam will describe the activity without naming it and offer an event as the answer.

Where this comes from

Cited
Scrum Guide section Product Backlog
What it says
Product Backlog refinement is the act of breaking down and further defining Product Backlog items into smaller more precise items.

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