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Scrum - Aalborg Universitetpeople.cs.aau.dk/~ivan/SWI/SWI03Scrum.pdf · The Scrum Master Mountain...
Transcript of Scrum - Aalborg Universitetpeople.cs.aau.dk/~ivan/SWI/SWI03Scrum.pdf · The Scrum Master Mountain...
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ScrumSWI MM3
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Agenda
• Scrum Origins
• Scrum Overview
• Team and Roles
• Sprints
• Daily Scrum
• Backlogs
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Scrum originsTakeuchi & Nonaka
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Takeuchi, Hirotaka and Nonaka, Ikujiro. 1986. The new new product development game. Harvard Business Review 64:1:137-146 (Jan/Feb), reprint no. 86116.
Takeuchi, Hirotaka and Nonaka, Ikujiro. 1995. The Knowledge-Creating Company : How Japanese companies create the dynamics of innovation. New York, Oxford University Press.
Takeuchi, Hirotaka and Nonaka, Ikujiro. 2004. Hitotsubashi on Knowledge Management. Singapore: John Wiley & Sons (Asia).
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Godfathers of Scrum:Hirotaka Takeuchi and Ikujiro Nonaka
jeffsutherland.com/scrum
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• Historical assumption is that high quality, product variety, and low cost cannot be achieved simultaneously.
• Toyota production system is based on totally different way of thinking.
• Through knowledge creation by synthesis of contradictions, Toyota pushes the envelope.
• High quality, high variety, and low cost all at once.
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Toyota synthesis of constraints
jeffsutherland.com/scrum
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Hirotaka Takeuchi and Ikujiro Nonaka, “The New New Product Development Game”, Harvard
Business Review, January 1986.
“The… ‘relay race’ approach to product development…may conflict with the goals of
maximum speed and flexibility. Instead a holistic or ‘rugby’ approach—where a team tries to go the distance as a unit, passing the
ball back and forth—may better serve today’s competitive requirements.”
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We’re losing the relay race
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Type A – Isolated cycles of work
Type B – Overlapping work
Type C – All at once
The overlapping of phases does away with traditional notions about division of labor. Takeuchi and Nonaka (1986)
NASA Waterfall
Fuji-Xerox Scrum
Honda Scrum
Requirements Analysis Design Implementation Testing
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Project Management Styles
jeffsutherland.com/scrum
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Rugby ScrumStart
GoalA small group is responsible for picking up the ball and moving it toward the goal.
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• Intended strategy is developed centrally. Emergent strategy self-organizes through local actions.–Distributed cognition and actions
• Scrum team must be allowed to self-organize–Autonomous–Transcendent–Cross-fertilization
• Team chooses own work–Individuals manage their own work–Management gets out of the way
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Breaking down command and control
jeffsutherland.com/scrum
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Scrum Overview
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• Microsoft• Yahoo• Google• Electronic Arts• High Moon Studios• Lockheed Martin• Philips• Siemens• Nokia• Capital One• BBC• Intuit
• Intuit• Nielsen Media• First American Real Estate• BMC Software• Ipswitch• John Deere• Lexis Nexis• Sabre• Salesforce.com• Time Warner• Turner Broadcasting• Oce
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Scrum has been used by:
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• Commercial software
• In-house development
• Contract development
• Fixed-price projects
• Financial applications
• ISO 9001-certified applications
• Embedded systems
• 24x7 systems with 99.999% uptime requirements
• the Joint Strike Fighter
• Video game development
• FDA-approved, life-critical systems
• Satellite-control software
• Websites
• Handheld software
• Mobile phones
• Network switching applications
• ISV applications
• Some of the largest applications in use
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Scrum has been used for:
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• Individual self-organizes work
• Team self-organizes around goals
• Architecture self-organizes around working code
• Product emerges through iterative adaptation
• Requires participative approach as opposed to authoritative approach
• Flat organizational structure
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Local action forces self-organization
jeffsutherland.com/scrum
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30 days
24 hours
Product BacklogAs prioritized by Product Owner
Sprint Backlog
Backlog tasksexpandedby team
Potentially ShippableProduct Increment
Daily ScrumMeeting
Scrum Lifecycle
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• Everyone in same location
• Open space without barriers
• Meeting facilities adjacent
• White boards
• Speaker phone
• Maximized communications
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Environment
jeffsutherland.com/scrum
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When all the team members are located in one large room, someones information becomes yours, without even trying.” Fuji-Xerox in Takeuchi and Nonaka (1986).
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Breaking down the cube walls
jeffsutherland.com/scrum
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• Product owner• Scrum Master• Team
Roles
• Sprint planning• Sprint review• Sprint retrospective• Daily scrum meeting
Ceremonies
• Product backlog• Sprint backlog• Burndown charts
Artifacts
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Scrum framework
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Team and Roles
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• Sprint planning• Sprint review• Sprint retrospective• Daily scrum meeting
Ceremonies
• Product backlog• Sprint backlog• Burndown charts
Artifacts
• Product owner• Scrum Master• Team
Roles
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Scrum framework
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• Define the features of the product• Decide on release date and content• Be responsible for the profitability of the
product (ROI)• Prioritize features according to market value • Adjust features and priority for every
iteration, as needed • Accept or reject work results
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Product owner
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• One person in this role ensures that only one set of requirements drives development
• Can be influenced by committees, management, customers, sales people, but is the only person that prioritizes
• Works with others to estimate items on Product Backlog
• Eliminates confusion of multiple bosses, different opinions, and interference
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Product Owner
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• Represents management to the project• Responsible for enacting Scrum values and
practices• Removes impediments • Ensure that the team is fully functional and
productive• Enable close cooperation across all roles and
functions• Shield the team from external interferences
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The Scrum Master
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• Cross-functional:
• Programmers, testers, user experience designers, etc.
• Members should be full-time
• May be exceptions (e.g., database administrator)
• Teams are self-organizing
• Ideally, no titles but rarely a possibility
• Membership should change only between sprints
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The team
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How Big is a Team?
• Typically 5-10 people
• Mike Cohn has led teams of 100+
• Ken Schwaber has led teams of 600+
• Obviously, very large teams are a very special case
• “Scrum of Scrums” technique
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Scaling through the Scrum of scrums
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Scrum of scrums of scrums
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Sprints
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• Product owner• ScrumMaster• Team
Roles
• Product backlog• Sprint backlog• Burndown charts
Artifacts
• Sprint planning• Sprint review• Sprint retrospective• Daily scrum meeting
Ceremonies
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Scrum framework
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• A fixed period of 30 days to develop a deliverable product
• The Sprint includes design, coding, testing, and documentation
• Once a Sprint has started only the Scrum Team can add or remove items in Sprint backlog
• Abnormal termination of Sprint is called for when the Sprint Goal no longer makes sense
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Sprint
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Sprint planning meeting
Sprint prioritization
• Analyze and evaluate product backlog
• Select sprint goal
Sprint planning
• Decide how to achieve sprint goal (design)
• Create sprint backlog (tasks) from product backlog items (user
stories / features)• Estimate sprint backlog in hours
Sprintgoal
Sprintbacklog
Business conditions
Team capacity
Product backlog
Technology
Current product
30Mountain Goat Software, LLC!
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• A short statement of what the work will be focused on during the sprint
Database Application
Financial services
Life Sciences
Support features necessary for population genetics studies.
Support more technical indicators than company ABC with real-time, streaming data.
Make the application run on SQL Server in addition to Oracle.
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The sprint goal
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• Team presents what it accomplished during the sprint
• Typically takes the form of a demo of new features or underlying architecture
• Informal–2-hour prep time rule–No slides
• Whole team participates• Invite the world
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The sprint review
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• Periodically take a look at what is and is not working
• Typically 15–30 minutes• Done after every sprint• Whole team participates
–ScrumMaster–Product owner–Team–Possibly customers and others
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Sprint retrospective
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Daily Scrum
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• Parameters–Daily–15-minutes–Stand-up
• Not for problem solving–Whole world is invited–Only team members, ScrumMaster, product owner, can
talk
• Helps avoid other unnecessary meetings
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The daily scrum
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• These are not status for the ScrumMaster–They are commitments in front of peers
What did you do yesterday?1
What will you do today?2
Is anything in your way?3
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Everyone answers 3 questions
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InadvancedScrums,theseareautomated.
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Daily Scrum Taskboard
jeffsutherland.com/scrum
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Backlogs
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• Product owner• ScrumMaster• Team
Roles
• Sprint planning• Sprint review• Sprint retrospective• Daily scrum meeting
Ceremonies
• Product backlog• Sprint backlog• Burndown charts
Artifacts
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Scrum framework
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• The requirements• A list of all desired work on the project
• Ideally expressed such that each item has value to the users or customers of the product
• Prioritized by the product owner
• Reprioritized at the start of each sprint
This is the product backlog
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Product backlog
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Backlog item Estimate
Allow a guest to make a reservation 3
As a guest, I want to cancel a reservation. 5
As a guest, I want to change the dates of a reservation.
3
As a hotel employee, I can run RevPAR reports (revenue-per-available-room)
8
Improve exception handling 8
... 30
... 50
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A sample product backlog
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• Individuals sign up for work of their own choosing–Work is never assigned
• Estimated work remaining is updated daily• Any team member can add, delete or change the sprint
backlog• Work for the sprint emerges• If work is unclear, define a sprint backlog item with a
larger amount of time and break it down later• Update work remaining as more becomes known
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Managing the sprint backlog
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TasksCode the user interface
Code the middle tier
Test the middle tier
Write online help
Write the foo class
Mon8
16
8
12
8
Tues4
12
16
8
Wed Thur
4
11
8
4
Fri
8
8
Add error logging
8
10
16
8
8
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Hou
rs
40
30
20
10
0Mon Tue Wed Thu Fri
TasksCode the user interface
Code the middle tier
Test the middle tier
Write online help
Mon8
16
8
12
Tues Wed Thur Fri4
12
16
7
11
8
10
16 8
50
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0
200
400
600
800
1.000
Hou
rs
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A sprint burndown chart
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Scrum and Innovation
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30 days
24 hours
Product BacklogAs prioritized by Product Owner
Sprint Backlog
Backlog tasksexpandedby team
Potentially ShippableProduct Increment
Daily ScrumMeeting
Can we make Scrum innovative?
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• Product owner• Scrum Master• Team
Roles
• Product backlog• Sprint backlog• Burndown charts
Artifacts
Ceremonies
Scrum team must be self-organizing project teams• Autonomy• Self-transcendence• Cross-fertilization
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• Slides marked
• are by Mike Cohn and found on www.mountaingoatsoftware.com
• Slides marked
• are by Jeff Sutherland
Acknowledgements
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Mountain Goat Software, LLC!
jeffsutherland.com/scrum