A Scrum Team is typically 10 or fewer people. Small teams communicate better and are more productive.
1The Visionary (PO)
The Product Owner represents the voice of the customer. They must balance the needs of stakeholders with the capacity of the team, always aiming to maximize the 'Return on Investment' (ROI) of every Sprint.
2The Guardian (SM)
The Scrum Master protects the team from outside interference. They aren't a secretary or a boss; they are a coach who ensures that Scrum is understood and enacted correctly.
3The Engine (Developers)
Developers in Scrum are cross-functional. This means they have all the skills necessary to create value each Sprint—coding, testing, design, and architecture all happen within the team.
4Step-by-Step Breakdown
Scrum teams are small, cross-functional, and self-managing. There are no hierarchies, only specific accountability to ensure the product succeeds.
The Product Owner (PO) is the 'Value Maximizer'. They decide WHAT to build by prioritizing the Product Backlog based on business needs.
The Scrum Master (SM) is the 'Servant Leader'. They don't tell people what to do; they remove blockers and coach the team on Scrum theory.
The Developers are the 'Creators'. They are the professionals who do the work of delivering a usable Increment every Sprint. They decide HOW to build it.
Who is responsible for prioritizing the items in the Product Backlog?
- →The Scrum Master
- →The Product Owner
- →The Stakeholders
- →The Development Team
Who decides HOW the work will be performed during a Sprint?
- →The Project Manager
- →The Product Owner
- →The Developers
- →The Scrum Master
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1Role Descriptions Should Name Accountability, Not Just Title
A slide that just lists 'Product Owner, Scrum Master, Developers' as icons conveys nothing to a screen reader user. Each role's actual accountability — who decides what, who removes blockers — needs to be in readable text, not just implied by an icon or color.
// Instead of three unlabeled icons
// Product Owner — decides WHAT (Backlog priority)
// Scrum Master — protects HOW WELL (process, impediments)
// Developers — decide HOW (technical execution)SEO Implications
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'Who Does What' Search Intent
Common queries like 'Scrum Master vs Product Owner' or 'can one person be both PO and SM' reflect genuine role-boundary confusion. Explicitly contrasting each accountability side by side answers this better than describing each role in isolation.
Best Practices
Keep Roles Distinct Even in Small Teams
It's tempting on a small team to merge Product Owner and Scrum Master into one person. It's allowed but risky — the PO's incentive to maximize scope can directly conflict with the SM's job of protecting the team's sustainable pace.
Let Developers Own 'How', Fully
If the Product Owner or Scrum Master start dictating implementation details, the Developers stop being self-managing. Their accountability for HOW the work gets done should be respected even when their approach differs from what leadership expected.
Frequent Bugs
A manager outside the three accountabilities starts assigning individual tasks to Developers, bypassing both the Product Owner's prioritization and the Developers' self-management.
Redirect prioritization requests to the Product Owner and implementation questions back to the Developers — no fourth role should be silently making decisions that belong to the three.
Real-World Examples
One Person Wearing Two Hats
A startup had the same person acting as both Product Owner and Scrum Master, and Sprint scope kept growing because there was no one pushing back on overcommitment.
// Conflict of interest
// As PO: 'Let's add two more items, stakeholders want it.'
// As SM: 'The team is already at capacity, we shouldn't add more.'
// Same person, competing incentives -> team burns out