“IT IS AN AXIOM THAT
INFLUENCE IS BOTH A
CAUSE AND AN EFFECT.
NOTHING IS EVER
INFLUENCED IN JUST
ONE DIRECTION.”
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“THE CAUSATION
FALLACY:
!
EVERY EFFECT HAS A
CAUSE AND WE CAN
TELL WHICH IS WHICH.”
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SYSTEMS
GENERAL
THINKING
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“EVERYTHING IS
A SYSTEM.
EVERYTHING IS
PART OF A
SYSTEM.”
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SYSTEMS
!
Thinking about systems as
dynamic, evolving patterns of
interaction and feedback.
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“JUST CALLING IT
‘FEEDBACK’ DOESN'T
MEAN THAT IS HAD
ACTUALLY FED BACK.
IT HASN'T FED BACK
UNTIL THE SYSTEM
CHANGES COURSE.”
JOHN GALL
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“IGNORING FEEDBACK
MERELY MEANS THAT THE
SYSTEM WILL EVENTUALLY
EXPERIENCE A MASSIVE
UNPLEASANT SURPRISE
(RATHER THAN A SMALL
UNPLEASANT SURPRISE).”
JOHN GALL
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“IT MAY LOOK
LIKE A CRISIS,
BUT IT'S ONLY
THE END OF AN
ILLUSION.”
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“SYSTEMS TEND
TO OPPOSE THEIR
OWN PROPER
FUNCTION.”
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“SYSTEMS
INHERENTLY
RESIST
CHANGE.”
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“THE MORE ADAPTED AN
ORGANISM IS TO
PRESENT CONDITIONS,
THE LESS ADAPTABLE IT
TENDS TO BE TO
UNKNOWN FUTURE
CONDITIONS.”
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“IT'S CALLED
‘SOFTWARE’ FOR A
REASON. IT'S
SUPPOSED TO BE
EASY TO CHANGE.”
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DESIGN
SOFTWARE
HAS A SLOW
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FAST ITERATION
LEAN STARTUP
AGILE
TDD
BDD
KANBAN
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FAST ITERATION
LEAN STARTUP
VALIDATED LEARNING
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FAST ITERATION
AGILE
COLLABORATE
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FAST ITERATION
TDD
DESIGN SMALL
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FAST ITERATION
BDD
COMMUNICATE
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FAST ITERATION
KANBAN
IMPROVE CONTINUOUSLY
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(broad generalisations)
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DESIGN
GOES DEEPER
DOMAIN-DRIVEN
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DOMAIN
PROBLEM SPACE
DOMAIN MODEL
SOLUTION SPACE
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DOMAIN
&
DOMAIN MODEL
IN SYNC
KEEP
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UBIQUITOUS
LANGUAGE
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DESIGN
TACKLES
DOMAIN-DRIVEN
COMPLEXITY
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ACCIDENTAL
COMPLEXITY
ESSENTIAL
COMPLEXITY
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DESIGN PATTERNS
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“DESIGN
PATTERNS ARE A
GATEWAY DRUG
TO DOMAIN-
DRIVEN DESIGN”
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SUPPLE DESIGN
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DECLARATIVE DESIGN
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REFACTORING
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BOUNDED CONTEXTS
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DISTILLATION
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LARGE SCALE
STRUCTURE
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MODELLING
WHIRLPOOL
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MODEL STORMING
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DESIGN
MATTER ?
DOMAIN-DRIVEN
So WHY DOES
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INFLUENCE
FEEDBACK
PATTERNS
SYSTEMS
COMPLEXITY
ITERATIONS
WHY CAN’T IT BE SIMPLE?
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“A LARGE SYSTEM,
PRODUCED BY EXPANDING
THE DIMENSIONS OF A
SMALL SYSTEM,
DOES NOT BEHAVE
LIKE THE SMALLER
SYSTEM”
JOHN GALL