model storming - a different approach to collaborative model discovery (vilnius edition)

Model Storming

A different approach to collaborative model discovery

Model Storming

Model Storming

avanscoperta

@ziobrando

#buildstufflt #modelstorming #eventstorming

About me@ziobrando

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I do something else instead

@ziobrandoAbout me

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About me@ziobrando

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@ziobrandoAbout meDDD enthusiast

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About me@ziobrando

!


@ziobrandoAbout meDDD enthusiastPost-it addicted

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About me@ziobrando

!


@ziobrandoAbout meDDD enthusiastPost-it addictedVisual thinker

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About me@ziobrando

!


@ziobrandoAbout meDDD enthusiastPost-it addictedVisual thinkerChaos summoner

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About me@ziobrando

!


@ziobrandoAbout meDDD enthusiastPost-it addictedVisual thinkerChaos summonerIdea thief

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About me@ziobrando

!


@ziobrandoAbout meDDD enthusiastPost-it addictedVisual thinkerChaos summonerIdea thief…never satisfied

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Part 1:

My insanely ambitious starting point

Typical enterprise architecture is flawed

© Alberto Brandolini 2013

Application

ApplicationApplication

Application

Application

Database

ApplicationApplication

Database

Typical enterprise architecture is flawed

Applicatio

n

Too much coupling

patches don’t help

Some folks call this a “model”

© Alberto Brandolini 2009© Alberto Brandolini 2011

So you want to speak the “Ubiquitous Language”, you scumbag?


The only ubiquitous language is SQL! Every Database speaks it!

So you want to speak the “Ubiquitous Language”, you scumbag?


Managing conflicting requirements is always a pleasure


So we have trade offs


When will we start refactoring?


When will we start refactoring?

Mañana!!

Problem checklistTypical enterprise software architecture is flawed

Data driven No bounded contexts

Conflicting requirements lead to trade-off solutions that ultimately clog our system The ever needed refactoring is always scheduled for the next week


Principle #1

The fastest way to remove crap from your system is…

To put NO CRAP into your system


Paratroopers


Paratroopers

Move towards the taleban area


Paratroopers


But this is Arizona…


Paratroopers


But this is Arizona…Let’s iterate!

There’s nothing wrong with “embrace

change”, but…

The starting point matters

Ignorance is the single greatest impediment

to throughput.

Dan Northhttp://dannorth.net/2010/08/30/introducing-deliberate-discovery/

http://dannorth.net/2010/08/30/introducing-deliberate-discovery/

Learning is the constraint

Dan Northhttp://dannorth.net/2010/08/30/introducing-deliberate-discovery/

http://dannorth.net/2010/08/30/introducing-deliberate-discovery/

Coding 20cl, learning 20cl, deciding 20cl, waiting...

When doing DDD...

Software development is a learning process

Working code is a side effect

Can we accelerate learning?

Part 2:Teach a man to fish

A simple solution

Put

Why don’t you put all of them in the

same room?


A simple solution

Put all the key stakeholders in the same room and

sketch a model together

That will never work

Reasons why this is a bad idea

Reasons why this is a bad ideaToo expensive to get all the key people in the same room at the same time

Reasons why this is a bad ideaToo expensive to get all the key people in the same room at the same timeThe meeting will be totally non productive

Reasons why this is a bad ideaToo expensive to get all the key people in the same room at the same timeThe meeting will be totally non productiveDisagreement will turn into a fight

Reasons why this is a bad ideaToo expensive to get all the key people in the same room at the same timeThe meeting will be totally non productiveDisagreement will turn into a fightThe meeting will be boring


They won’t come again


They won’t come againThey’ll blame me

Solution #1


1. Designate a scapegoat 2. Let him call the meeting

Solution #2Break some assumptions

Implicit assumptions


The meeting will happen around a table


The meeting will happen around a tableWhen one person speaks many will be bored


The meeting will happen around a tableWhen one person speaks many will be boredWhen many person speak nobody will understand


The meeting will happen around a tableWhen one person speaks many will be boredWhen many person speak nobody will understandWe’ll talk about technical things


The meeting will happen around a tableWhen one person speaks many will be boredWhen many person speak nobody will understandWe’ll talk about technical thingsI’ll have to bring my smartphone with me

That’s how I run meetings


The challenge

Can we run a meeting worth more than the hourly cost of

the participants?

Event Storming!

Yes, I mean that much space...


My best friend

And… no table.

It’s no fun to just watch others play

Events are precise

Event are meaningful

We’re getting to the aggregates outside-in

Observe people


Observe people

help those who are not participating


Observe people


remove impediments and bottlenecks


Observe people



Spot the ones who don’t belong here


Observe people




Spot the ones that care


Observe people




Spot the ones that careManage conflicts


I love conflicts here…


Or we can simply put a

RED Marker

There’s nothing wrong in learning

stuff faster

This summer…


A little communityStarted experimenting



@mathiasverraes



@mathiasverraes @heimeshoff



@mathiasverraes @heimeshoff@andreabalducci




@tojans




@tojans

@tjaskula




@tojans

@tjaskula@yreynhout




@tojans

@tjaskula@yreynhout

@alessandrocolla




@tojans

@tjaskula@yreynhout

@alessandrocolla @jefclaes




@tojans

@tjaskula@yreynhout

@alessandrocolla @jefclaes@lorenzomassacci




@tojans

@tjaskula@yreynhout

@alessandrocolla @jefclaes@lorenzomassacci

@sleli


And the experiments worked!



“This is awesome!”



“This is awesome!”“For the first time,

developers started asking the right questions!”



“This is awesome!”“For the first time,

developers started asking the right questions!”

“We turned the model into implementation on the same afternoon”


And the experiments triggered new ideas



“Let’s use it to set up our Kanban board!”




“is there a UX version of the workshop?”





“How can we use this to steer implementation?”





“How can we use this to steer implementation?”

“We used a different set of rules”

Part 4:Model Storming

or Meta fishing

I know, Part 3 is missing…

Why does this work?

My secret weapon?


What is Model Storming?


What is Model Storming?Unlimited Modeling Space



Iterative notation



Iterative notationSimple Gaming Rules



Iterative notationSimple Gaming RulesActive Collaboration




Addressing Complexity




Addressing ComplexityEverything is visible





Supporting divergence





Supporting divergenceDecide later


Unlimited Modeling Space

My problem is...


Unlimited Modeling Space

My problem is...

BIGGER

You know why people call it “the big

picture?”

Conquer first Divide later


Guerrilla modeling


Unlimited surface


Unlimited surfaceYou don’t know the size of the

problem before exploring it


Iterative notation


Iterative notation

Choose one significant aspect


Iterative notation


Find the simplest possible notation to represent it


Iterative notation


Find the simplest possible notation to represent it

Choose the next aspect to model


Active Collaboration

All participant should actively contribute


One Man

One Marker

Gamification!

Our brain...

http://www.wpclipart.com/medical/anatomy/brain/four_lobes_of_the_cerebral_cortex.png.html

http://www.wpclipart.com/medical/anatomy/brain/four_lobes_of_the_cerebral_cortex.png.html

System 1

System 1Quick pattern matching


Parallel processing, unaware mode



Low energy consumption




System 2




System 2Complex elaboration that need attention and concentration




System 2

No parallelism

Complex elaboration that need attention and concentration




System 2

High energy consumption

No parallelism


Maybe there’s a reason for that

Let’s examine carefully every possibility




System 2


No parallelism





System 2


No parallelism


It’s the same class!




System 2


No parallelism



It’s obvious!




System 2


No parallelism



It’s obvious!

Let’s consider Bounded Contexts




System 2


No parallelism



It’s obvious!

Let’s consider Bounded Contexts

Let’s see the whole


Our brain


Our brainQuick in pattern matching



(and unaware of it)



(and unaware of it)Provides inferior solutions

under pressure




under pressureTries to avoid complexity




under pressureTries to avoid complexityGets hooked by games


Can you walk by without completing?


And, by the way, playing is how we learn better

Icebreakers needed


Deferring decisions

Implicit choices There’s nothing *right* yet

No legacy

Embrace Fuzzyness (temporarily)

It will compile

I promise

Data first, structure later…

Addressing Complexity

Everybody is partitioning the

system

I just like taking a detour first...


Visual representation

UML is too complex to support a meaningful

conversation! !

Whiteboards won’t compile anyway


Visualize everything


Visualize everything

Legend and Notation Requirements and solution

Solutions Disagreement

Context ...

Keep the cognitive load small

Design the workshop User Experience


Exploring

Guys, we’re doing this one really badly


Brainstorming rules

“We need at least 3 bad ideas”

Short timeboxes throwaway code

...more ;-)

coderetreat.org

coderetreat.org

Can we tweak it?

Modellathlon!

Human beings are the best device ever…

…to detect somebody else’s mistakes


Negotiating

We need a tangible enemy if there’s none ...

Your colleague becomes the enemy


Negotiatingimplicit meaning

Blah, blah, blah...

...And obviously, blah,

blah...

Blah, blah, blah...

Ouch, he didn’t mention wah, wah...

A tangible artifact becomes the enemy

Your colleague becomes your ally


Proving

Still… negotiating is waste It’s not about convincing the

others...

Those are learning cycles

Watching the ceiling is forbidden!

Scope?

Complex problems


Event Storming

expected outcome steered towards a canonical

model partially defined steps

model affinity given problem type


Model storming

unpredictable outcome no canonical model notation incremente

iteratively !

no predefined problem type

Some problems are resistant to antibiotics

It’s a fun job and

somebody’s gotta do it

Let’s go fishing!

Grazie!@ziobrando

!

http://ziobrando.blogspot.com/2013/11/introducing-event-storming.html

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http://ziobrando.blogspot.com/2013/11/introducing-event-storming.html

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model storming - a different approach to collaborative model discovery (vilnius edition)

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