@MATHIASVERRAES

DESIGNMATTERS

DOMAIN-DRIVENWHY

Mathias VerraesStudent of Systems Meddler of Models Labourer of Legacy

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SET OF DESIGN PATTERNS?

SET OF DESIGN PATTERNS? METHODOLOGY?

SET OF DESIGN PATTERNS? METHODOLOGY?

TOTAL APPROACH TO DEALING WITH COMPLEXITY?

SET OF DESIGN PATTERNS? METHODOLOGY?

TOTAL APPROACH TO DEALING WITH COMPLEXITY?

PHILOSOPHY?

INFLUENCEORGANISATION!

⬇!

SOFTWARE

INFLUENCEORGANISATION!

⬇SOFTWARE

ORGANISATION

!

⬇

INFLUENCE- ORGANISATION -

- SOFTWARE - HARDWARE - - RESPONSIVENESS TO BUGS -

- CONTRACTS - THIRD PARTIES - - DEVELOPER HAPPINESS - TOOLS -

- TESTS - SKILLS - COMMUNICATION -

“IT IS AN AXIOM THAT INFLUENCE IS BOTH A

CAUSE AND AN EFFECT. NOTHING IS EVER

INFLUENCED IN JUST ONE DIRECTION.”

CHARLEY PETERS

“THE CAUSATION FALLACY:

!

EVERY EFFECT HAS A CAUSE AND WE CAN

TELL WHICH IS WHICH.”

GERALD M. WEINBERG

SYSTEMSGENERALTHINKING

“EVERYTHING IS A SYSTEM.

EVERYTHING IS PART OF A SYSTEM.”

GERALD M. WEINBERG

SYSTEMS!

Thinking about systems as dynamic, evolving patterns of

interaction and feedback.

“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

“IGNORING FEEDBACK MERELY MEANS THAT THE SYSTEM WILL EVENTUALLY

EXPERIENCE A MASSIVE UNPLEASANT SURPRISE (RATHER THAN A SMALL

UNPLEASANT SURPRISE).”

JOHN GALL

“IT MAY LOOK LIKE A CRISIS, BUT IT'S ONLY

THE END OF AN ILLUSION.”

GERALD M. WEINBERG

“SYSTEMS TEND TO OPPOSE THEIR

OWN PROPER FUNCTION.”

HENRI LOUIS LE CHATELIER

“SYSTEMS INHERENTLY

RESIST CHANGE.”

SCOTT PECK

“THE MORE ADAPTED AN ORGANISM IS TO

PRESENT CONDITIONS, THE LESS ADAPTABLE IT

TENDS TO BE TO UNKNOWN FUTURE

CONDITIONS.”SIR RONALD FISHER

“IT'S CALLED ‘SOFTWARE’ FOR A

REASON. IT'S SUPPOSED TO BE

EASY TO CHANGE.”UNCLE BOB?

DESIGNSOFTWAREHAS A SLOWFEEDBACK CYCLE

FAST ITERATIONLEAN STARTUP AGILE TDD BDD KANBAN

FAST ITERATIONLEAN STARTUP VALIDATED LEARNING

FAST ITERATIONAGILE COLLABORATE

FAST ITERATIONTDD DESIGN SMALL

FAST ITERATIONBDD COMMUNICATE

FAST ITERATIONKANBAN IMPROVE CONTINUOUSLY

(broad generalisations)

DESIGNGOES DEEPERDOMAIN-DRIVEN

DOMAINPROBLEM SPACE

DOMAIN MODELSOLUTION SPACE

DOMAIN&

DOMAIN MODELIN SYNC

KEEP

UBIQUITOUSLANGUAGE

DESIGNTACKLES

DOMAIN-DRIVEN

COMPLEXITY

ACCIDENTAL COMPLEXITY ESSENTIAL

COMPLEXITY

DESIGN PATTERNS

“DESIGN PATTERNS ARE A GATEWAY DRUG

TO DOMAIN-DRIVEN DESIGN”

ROSS TUCK

SUPPLE DESIGN

DECLARATIVE DESIGN

REFACTORING

BOUNDED CONTEXTS

DISTILLATION

LARGE SCALE STRUCTURE

MODELLING WHIRLPOOL

MODEL STORMING

DESIGNMATTER ?

DOMAIN-DRIVENSo WHY DOES

INFLUENCE FEEDBACK PATTERNS SYSTEMS

COMPLEXITY ITERATIONS

WHY CAN’T IT BE SIMPLE?

“A LARGE SYSTEM, PRODUCED BY EXPANDING

THE DIMENSIONS OF A SMALL SYSTEM,

DOES NOT BEHAVE LIKE THE SMALLER

SYSTEM”JOHN GALL

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