Kanban Development and the Paradigm of Flowalissonvale.com/downloads/Kanban Development and The...
Transcript of Kanban Development and the Paradigm of Flowalissonvale.com/downloads/Kanban Development and The...
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Kanban Development and the Paradigm of Flow
Alisson ValeTechnical Leader
http://alissonvale.com/
Looking for Sustentability in
Software Development
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Software development is knowledge work
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In software, knowledge work can involve a large variety of activities
research
new product development
modification
reuse
re-engineering
maintenance
support
implantation
sustaining
data operations
evolution
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direct ou indirectly we have to deal with those activities
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other factors affect usculture
people
technology
business
risk
resources
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the amount of scenarios and contexts is huge
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“Best practices are only ‘best’ in certain contexts and to achieve certain objectives. A change in either the context or the objective can quickly transform a ‘best practice’ into a stupid approach.”
Don Reinertsen
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“Kanban is about the notion that your system is truly different and we will not impose a process upon you”.
David Anderson
“Nothing else in their world should have changed. Job descriptions are the same. Activities are the same. Handoffs are the same. Artifacts are the same. Their process hasn't changed other than you are asking them to accept an WIP limit and to pull work rather than receive it in a push fashion”.
David Anderson
After a Kanban Implementation…
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Kanban allows you to design processes that fit to the context, instead of manipulating the context to fit a specific process
Context is relevant, so…
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the key words are…
"design"
“processes”
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A collaborative exercise for Process Design
provide thinking and action tools to empower people when they are designing their own processes
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but there is more…
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Kanban is also a Mindset
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The Mindset of a Kanban System
Thinking Tools
Process Design Patterns
Collaboration and Team Model Patterns
Capability Measurements
A Culture of Continuous Improvement
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Thinking Tools
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“Analythical thought doesn’t produce understanding, it produces knowledge. The product of analysis is the knowledge about how things work, not why they work the way they do. System thinking produces understanding.”
Russel Ackoff
#1 System Thinking
Thinking Tools
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#2 Lean Thinking
Thinking Tools
Thinking about making value flowsthrought the system, improving processes continuouslyand eliminating wasteprogressively.
"All we are doing is looking at the time line, from the moment the customer gives us an order to the point when we collect the cash. And we are reducing the time line by reducing the non-value adding wastes.“
Taiichi Ohno
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leveraging systems by being aware of their bottlenecks.
#3 Theory of Constraints
Thinking Tools
“A system of local optimums is not an optimum system at all”
Eliyahu M. Goldratt
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#4 Queueing Theory
Thinking Tools
"The average time in the system is equal to the average time in queue plus the average time it takes to receive service."
Little's law
managing the unpredictable nature of arrival times and task durations.
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#5 Real Options
Thinking Tools
Chris Matts and Olav Maassen
“By avoiding early commitments, you gain flexibility in the choices you have later.”
More Info: http://www.infoq.com/articles/real-options-enhance-agility
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Process Design Tools and Patterns
Value Stream MapVisual ManagementPull System & Single piece-flowLimited WIP
Buffers & Queue LimitsClasses of ServiceLeveling Work Two tiered Systems (Expand/Collapse)Swimlanes/ExpeditingTriggersPriority FiltersPerpetual Multivote for pull Schedulling
Essential ToolsPatterns for Process Design
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Essential ToolsValue Stream MapVisual ManagementPull System & Single piece-flowLimited WIP
Analysis &Preparation
Wait.Selection
Queue Develop. Queue Verification Queue Deploy
Waiting in the Product
Backlog
Waiting in theIteration Backlog
Waiting for verification
and homologation
Waiting for release
T1 T2 T3 T4 T5 T6 T7 T8
Eficiency (%) =TValue
TWasteTValue +
* 100
Value Stream for Product XYZ
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Essential ToolsValue Stream Map
Visual ManagementPull System & Single piece-flowLimited WIP
Waiting forSelection
Analysis &Preparation
Queue Verification DeployQueueQueueDevelop.
Value Stream for Product XYZ
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Essential ToolsValue Stream MapVisual Management
Pull System & Single piece-flowLimited WIP
DeployQueue
PULL
Value Stream for Product XYZ
Waiting forSelection
Analysis &Preparation
Queue VerificationQueueDevelop.
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“People with different skills have to work together to deliver product features. Don’t build features that nobody needs right now. Don’t write more specs than you can code. Don’t write more code than you can test. Don’t test more code than you can deploy.”(…)“Pretty simple to describe in theory. Some subtlety in practice. A kanban is a tool, and like any tool, it is meant to solve a problem. I think kanban solves this problem more efficiently than the known alternatives.”
Corey Ladas
Why pull? Why kanban?
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Essential ToolsValue Stream MapVisual ManagementPull System & Single piece-flow
Limited WIP
Deploy
Limited WIP = 4Value Stream for Product XYZ
Waiting forSelection
Analysis &Preparation
Queue Verification QueueQueueDevelop.
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Essential ToolsValue Stream MapVisual ManagementPull System & Single piece-flow
Limited WIP
Deploy
Limited WIP = 4Value Stream for Product XYZ
Waiting forSelection
Analysis &Preparation
Queue Verification QueueQueueDevelop.
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Essential ToolsValue Stream MapVisual ManagementPull System & Single piece-flow
Limited WIP
Deploy
Limited WIP = 4Value Stream for Product XYZ
Waiting forSelection
Analysis &Preparation
Queue Verification QueueQueueDevelop.
?
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Essential ToolsValue Stream MapVisual ManagementPull System & Single piece-flow
Limited WIP
Deploy
Limited WIP = 4
Decision Point
Value Stream for Product XYZ
Waiting forSelection
Analysis &Preparation
Queue Verification QueueQueueDevelop.
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Patterns for Process DesignBuffers & Queue LimitsClasses of ServiceLeveling WorkTwo-tiers
Waiting forSelection
Diagnosis
Buffer
ResolvedResolution
Buffer
Verification
Buffer
#2
#3
#4
#5
#1
[ 5 ][ 2 ]
[ 2 ]
[ 3 ]
[ 1 ] [ 1 ]
[ 1 ]
Notification
[ 1 ]
Value Stream for Support Operations
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Patterns for Process DesignBuffers & Queue Limits
Classes of ServiceLeveling WorkTwo-tiers
Classes of Service influence behaviour of the work in the system by being:
• Time-sensitive• Risk-sensitive• Flow-sensitive• Policy-sensitive
or by having whatever differentiation that matters for your process
Colors and symbols are used to differentiate work items of different classes of services.
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Patterns for Process DesignBuffers & Queue Limits
Classes of ServiceLeveling WorkTwo-tiers
VerificationQueueDevelop.
Decision Point
Value Stream for Product XYZ
Classes of Service can be one more decision element for team members
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Patterns for Process DesignBuffers & Queue LimitsClasses of Service
Leveling WorkTwo-tiers
Diagnosis
Buffer
Resolution
Buffer
Verification
Buffer
[ 2 ]
[ 2 ]
[ 3 ]
[ 1 ] [ 1 ]
[ 1 ]
Notification
[ 1 ]
S
S
M
S
S
S
SG
S: less than 1 day of work M: less than 3 days G: less than 5 days
T-Shirt Sizing
ClassificationOver Estimation
ReferenceOverCommitment
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Patterns for Process DesignBuffers & Queue LimitsClasses of ServiceLeveling Work
Two-tiers (Expand/Collapse)
Waiting forSelection
Release
Value Stream for Product XYZ
MMF #1
MMF #2
[ 2 ] [ 4 ]Preparation
[ 2 ]Develop.
[ 1 ]Queue
[ 1 ]Verification
MMF #3MMF #4
MMF #5
In Progress
Expand Collapse
MMF: Minimum Marketable Feature
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Patterns for Process DesignSwimlanes/ExpeditingTriggersPriority FiltersPerpetual Multivote for pull Schedulling
Waiting for Selection Delivery
Value Stream for Sustaining Products with Shared Resources
[ 2 ]Preparation
[ 2 ]Develop.
Queue
[ 1 ]ISO-DOC
Waiting for Selection Delivery[ 3 ]
Preparation
[ 4 ]Develop.
Queue [ 1 ][ 1 ]
Verification[ 1 ]
Verification[ 1 ]
Approval
Regular Customer
Super Customer
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Patterns for Process DesignSwimlanes/ExpeditingTriggersPriority FiltersPerpetual Multivote for pull Schedulling
Waiting for Selection Delivery
Value Stream with Swimlane to expediting work
[ 2 ]Preparation
[ 1 ]Develop.
Queue
[ 1 ]ISO-DOC
Queue [ 1 ][ 1 ]
Verification[ 1 ]
Approval
Super Customer
Expedite
DeliveryPreparation Develop. ISO-DOC VerificationApproval[ 1 ] [ 1 ] [ 1 ] [ 1 ][ 1 ]
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Patterns for Process DesignSwimlanes/Expediting
TriggersPriority FiltersPerpetual Multivote for pull Schedulling
Events can trigger a card or a collection of cards to move forward to another stage in the process
Examples:
When a signed approval form is received
When the build passes
When the proposal is sent
When a certain number of user stories are done
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Patterns for Process DesignSwimlanes/ExpeditingTriggers
Priority FiltersPerpetual Multivote for pull Schedulling
“What we really want is a method that allows us to make good sequencing decisions as late as possible and for the lowest incremental cost”.Corey Ladas
[ 3 ]No Capacity
[ 5 ]No Pressure Current
Capacity [ 2 ]
Uncertainty guides these limits Capacity guides this limit
Backlog
We should work on this soon
We have to do, but no capacity available
We intend to work on this immediately
Designing the Selection Process
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Patterns for Process DesignSwimlanes/ExpeditingTriggers
Priority FiltersPerpetual Multivote for pull Schedulling
[ 3 ]No Capacity
[ 5 ]No Pressure Current
Capacity [ 2 ]Backlog
Designing the Selection Process
three quick decisions with one weak commitment
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Patterns for Process DesignSwimlanes/ExpeditingTriggersPriority Filters
Perpetual Multivote for pull Schedulling
Designing the Selection Process
Also great for injection of improvement items into the system by using a democratic selection approach
Source: http://leansoftwareengineering.com/2008/09/29/perpetual-multivote/
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Process OwnershipSwarmingKanban daily standup meetingsFeature Teams/Teamlets
Collaboration and Team Model Patterns
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Patterns for CollaborationProcess OwnershipSwarmingKanban daily standup meetingsFeature Teams/Teamlets
Self-Organization/Process Ownership
Stages, limits, buffers, work size, triggers, daily-basis decisions and all other process definitions are in
control of the team.
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Patterns for CollaborationProcess Ownership
SwarmingKanban daily standup meetingsFeature Teams/Teamlets
“The stages in a workflow are not people, or even roles. Just stages. So anyone can do them.”
Karl Scotland
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Patterns for CollaborationProcess Ownership
SwarmingKanban daily standup meetingsFeature Teams/Teamlets
Immediate response and cooperation to solve a flow interruption issue.
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Patterns for CollaborationProcess OwnershipSwarming
Kanban daily standup meetingsFeature Teams/Teamlets
“How big can an effective standup be?”“This is a picture of a standup meeting on a large project at Corbis. Today I counted 41 attendees. The attendance has averaged 39 or 40 every day for 6 weeks.”
David Anderson
Focus on changes on the board, instead of assignments of each person.
Source: http://www.agilemanagement.net/Articles/Weblog/Howbigcananeffectivestand.html
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Patterns for CollaborationProcess OwnershipSwarmingKanban daily standup meetings
Feature Teams/Teamlets
Value Stream for Product XYZ
MMF #2
MMF #3
Cross-functional teams can be formed as people are getting involved with different units of work.
In, some cases, a dedicated team can be assigned to a specific unit of value from beginning to completion.
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Cycle Time/Lead TimeSLAThroughtputCumulative Flow Diagrams
Capability Measurements
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Capability MeasurementsCycle Time/Lead TimeSLAThroughtputCumulative Flow Diagrams
Lean is about timeCycle time
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Capability MeasurementsCycle Time/Lead TimeSLAThroughtputCumulative Flow Diagrams
Lead time
CustomerRequestService
CustomerReceiveService
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Capability MeasurementsCycle Time/Lead Time
SLAThroughtputCumulative Flow Diagrams
Work Item Cycle Time
1456 2,34
1532 1,91
1588 1,68
1638 0,89
1644 2,12
SLA Factor %
1,0 20%
1,5 20%
2,0 60%
2,5 100%
3,0 100%
Given the last 30 days of work of a certain type and size...
SLA should be a reference, not a contractual commitment
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Capability MeasurementsCycle Time/Lead TimeSLA
ThroughtputCumulative Flow Diagrams
Throughtput can be useful for Senior Manager analysis and for understanding System performance
DDP – Due Date Performance
Volume that missed SLA
Volume that was delivered on Time
Throughtput transparency can lead you to build a strong trusting relationship with business investors
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Capability MeasurementsCycle Time/Lead TimeSLA
ThroughtputCumulative Flow Diagrams
The importance of throughtput is not in establishing and achieving goals,
but in putting the system under control.
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Capability MeasurementsCycle Time/Lead TimeSLAThroughtput
Cumulative Flow Diagrams
Cumulative Flow Diagrams bring WIP and bottlenecks to the throughtput analysis
Source: http://leadinganswers.typepad.com/leading_answers/2006/09/creating_and_in.html
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To Establish a Culture for Continuous Improvement
When doing Operation Reviews
When trying to enable CI Actions
By expanding oportunities for Improvements
BottlenecksWaste Elimination Variability Reduction
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Read more...
Blog Articleshttp://alissonvale.com/englishblog
Interview on InfoQ Brazil (Portuguese)http://www.infoq.com/br/news/2009/01/brasil-representacao-conferencia
The History of a Kanban System (Portuguese)http:// alissonvale.com/englishblog/post/A-Historia-de-um-Sistema-Kanban.aspx
Kanban: When Signalization Mattersalissonvale.com/englishblog/post/Kanban-When-Signalization-Matters.aspx
ContactMail: [email protected]: http://alissonvale.com/englishblogTwitter: http://twitter.com/alissonvale
Thank you!
Limited WIP Societyhttp://limitedwipsociety.org