Scrum Basics - Roles and Events

From the Scrum guide

Events	Sprint	Sprint Planning	Daily Scrum	Sprint Review	Sprint Retrospective	Backlog Refinement¹
Timebox	Max 1 month	8 hours	15 minutes	4 hours	3 hours	10% of sprint
Product Owner		Present: Mandatory - Explain top of Product Backlog - Define a sprint goal with the dev team - answers questions of the dev team	Present: Allowed in the room - No active role during the daily scrum	Present: Mandatory - Chairman - Clarify questions from stakeholders - Invites stakeholders	Present: Mandatory - Participate as scrum team member	Present: Mandatory - Prepare backlog - Answers questions from the team
Development Team		Present: Mandatory - Select a set of PBI's to meet sprint goal - Define a sprint goal with PO - Create a plan to realize sprint goal	Present: Mandatory Synchronize & replan the sprint backlog - Three questions (yesterday, today, impediments)	Present: Mandatory - Participate - Clarify questions from stakeholders - Prepare the meeting with the PO	Present: Mandatory - Participate	Present: Mandatory - Ask questions - Provide estimates
Scrum Master		Present: Mandatory - Facilitates Event - Coach the team and PO	Present: Optional - Observer - Coach the team	Present: Mandatory - Ensure the right interactions take place	Present: Mandatory - Participate - Facilitate the event	Present: Optional - Help by facilitating - Coach the team and PO
Stakeholders²		Present: On invitation - Clarify deeper intent of PBIs	Not Present	Present: Mandatory - Provide feedback - Ask questions	Not Present	Present: On Invitation - Clarify deeper intent of PBIs
Artifacts ³	- Increment - Product Backlog - Sprint Backlog	Create the Sprint Backlog	Inspect the Sprint Backlog	Inspect the Increment Adapt the Product Backlog	Create Backlog Item for self Improvement	Adapt Product Backlog Items

1. Not an official scrum event but an activity
2. Not an official scrum role
3. Definition of Done is not an official artifact

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