systems concepts for agile practitioners
Post on 17-Oct-2014
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DESCRIPTION
Agile software development practices are based on a set of values and principles described in the Agile Manifesto. As change agents for Agile transformation, we rely on these to help get the message across. There is another layer below principles, a set of scientific models that can help explain why the principleswork and strengthen the Agile message for some audiences. These are described in this presentation.TRANSCRIPT
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Systems Concepts for Agile Practitioners
Agile San Diego5/1/14
Roger Brown, CSC, CST
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The significant problems we face today cannot be solved at the same level of thinking at which they were created.
- Albert Einstein
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Why?
Chaotic
Complex
Complicated
SimpleHuman History
Technological advance and growing population in a finite space have increased the complexity of human interactive structures.
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Systems are greater than the sum of their parts.
System properties and behaviors emerge from the combination of its constituent parts
Reductionism is not sufficient. Our systems are dynamic and driven by nonlinear effects that are not easily understood.
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Helpful Theoretical Models
Queuing Theory – Erlang 1910Lean Thinking – Deming 1940System Dynamics – Forrester 1950Automata Theory – 1940 Ulam and von NeumannNetwork Theory - 1970Complexity Theory - 1970Learning Organization – 1990 Senge
A model is a simplification of reality intended to promote understanding.
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System Dynamics
A system is an entity which maintains its existence through the mutual interaction of its parts.
- Gene Bellinger
Orderly processes in creating human judgment and intuition lead people to wrong decisions when faced with complex and highly interacting systems.
- Jay Forrester
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Counter-intuitive Behavior
System behaviors come from structures,not from coefficients
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Feedback Mechanisms
Reinforcing feedback Balancing feedback
+
Credit CardBalance
Credit CardInterest
+
+
BodyTemp
Sweat
-
3 examples from www.beyondconnectingthedots.com
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Feedback Delay
Time
Des
ired
Stat
eLong delay causes
wider swings
Short delay converges sooner
Agile/Lean achieve smoother flow and reduced risk by shortening
the delay time for feedback
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Cost of Change and Feedback Delay
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Lean Thinking95% of variation in the performance of a system (organization) is caused by the system itself and only 5% is caused by the people.
- W. Edwards Demming
Misconception easily turns into common sense.- Taiichi Ohno
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Push & Pull Systems
Push systems overwhelm capacity, creating turbulence, rework, waste and delay
Pull systems have a steady flow that provides predictability
♫
Push
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Push PullMake a plan Have a queue of work and a goal
Track % completion of plan Measure throughput and work done
Buffer plan for contingencies Small, frequent tasks to manage variety
Plan decides what to do next People decide what to do next
Long feedback delay Continuous short feedback loops
Demand exceeds capacity Demand limited to capacity
Fixed scope and time Fixed WIP
Forecast based on estimates Forecast based on data
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Little’s Law
Cycle Time = Number of Items in Process/System Capacity
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?
Single Piece Flow
Do This
Don’t Do This
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Unintended Consequences
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Local Optimization
A focus on one property can have unintended impact on the system as a whole
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Goodhart’s Law
The moment a measure becomes a target, it ceases to be useful as a measure.
Story Points/Sprint
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Complexity Theory
Complicated
Complex
Click pictures to view examples.
• Many different parts.
• Can take it apart and reassemble it.
• If one part fails, it all fails.
• Many similar parts acting independently within social rules.
• Aggregate behavior cannot be predicted from individual part behaviors.
• Still “works” if a part is removed.
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Cynefin Framework
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Sense
Input What our senses tell us
Probe How we use our senses to get new information
Mental Models What sense we make of new information
Actions, Experiments What makes sense to do next
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Sense-Making
Tools- anecdote.com- getreframer.com- sensemaker-suite.com
We make decisions based on our patterns and mental models,not on information or theory.
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Learning Organizations
1.Systems Thinking2.Personal Mastery3.Mental Models4.Building Shared Vision5.Team Learning
The Disciplines
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Working as a Team
Organizations where people continually expand their capacity to create the results they truly desire, where new and expansive patterns of thinking are nurtured, where collective aspiration is set free and where people are continually learning how to learn together.
- Peter Senge The Fifth Discipline, 1990
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Urgent Not Urgent
Important
I• Crises• Pressing
Problems• Deadline Driven
Projects, Meetings, etc.
II• Preparations• Learning• Kaizen Events• Relationship
Building• True Recreation
Not Important
III• Interruptions• Some phone
calls• Some email• Someone else’s
emergency
IV• Trivia• Busy work• Time wasters• “Escape” activities
When do we get time to improve?If we don’t spend any time sharpening the saw, we will have to work harder and harder to get the same results.
- Steven Covey, The 7 Habits of Highly Effective People, 2004
By intentionally creating downtime, or ‘slack’, management will find a much-needed opportunity to build a ‘capacity to change’ into an otherwise strained enterprise that will help companies respond more successfully to constantly evolving conditions.
- Tom DeMarco, Slack, 2002
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Learning Levels
Single Loop: tweak the parameters
Double Loop: experiment with the process
Triple Loop: learn how to learn
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RetrospectivesCommunities of PracticeBook ClubBrown Bag SeminarsShadowingStory TellingKnowledge ManagementBrainstormingSkills Exchange
Team Learning Tools
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ReferencesBooks:• Thinking in Systems : A Primer – Meadows• The Fifth Discipline and its Fieldbook – Senge• Business Dynamics - Sterman• The Principles of Product Development Flow: Reinertsen• The Systems Bible – Gall• 10 Steps to a Learning Organization – Kline and Saunders• Learning in Action – Garvin• Systems Thinking Playbook – Sweeny and Meadows
Websites- www.beyondconnectingthedots.com/ - Bellinger- www.cognitive-edge.com – Snowden- www.systemdynamics.org
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PresenterRoger Brown
Agile CoachScrum Alliance
M.S. System Dynamics, Dartmouth College 1977Contact
Email: [email protected] Twitter: rwbrown Blog: www.agileCoachJournal.comLinkedIn: http://www.linkedin.com/in/rogerwbrown