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

Model Storming

A different approach to collaborative model discovery

Model Storming

avanscoperta

@ziobrando

#buildstufflt #modelstorming #eventstorming

About me@ziobrando

I do something else instead

@ziobrandoAbout me

avanscoperta

About me@ziobrando

@ziobrandoAbout meDDD enthusiast

avanscoperta

About me@ziobrando

@ziobrandoAbout meDDD enthusiastPost-it addicted

avanscoperta

About me@ziobrando

@ziobrandoAbout meDDD enthusiastPost-it addictedVisual thinker

avanscoperta

About me@ziobrando

@ziobrandoAbout meDDD enthusiastPost-it addictedVisual thinkerChaos summoner

avanscoperta

About me@ziobrando

@ziobrandoAbout meDDD enthusiastPost-it addictedVisual thinkerChaos summonerIdea thief

avanscoperta

About me@ziobrando

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

avanscoperta

Part 1:

My insanely ambitious starting point

Typical enterprise architecture is flawed

Application

ApplicationApplication

Application

Database

ApplicationApplication

Database

Typical enterprise architecture is flawed

Applicatio

Too much coupling

patches don’t help

Some folks call this a “model”

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?

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

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/

Learning is the constraint

Dan Northhttp://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

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

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 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

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

@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?”

“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

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

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

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

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

http://www.avanscoperta.it

avanscoperta

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

Business

brain storming. objectives session 1 - brain storming...

storming castle -...

storming barricades

game storming mini treinamento

xxi brain storming beninato - phd.dees.unict.itxxi xxi brain...

workshop event storming

event storming

body storming

jawaban brain storming

vilnius logic: what makes vilnius "vilnius"

angles storming london

brain storming

erselgida.com.trerselgida.com.tr/uploads/erselgida/erselkatalog.pdfvivident...

사용자경험유지하기(@ux storming/2012)

graphical robotc tutorial packet storming...

action storming

game storming 101

team for brain storming

social media storming

brain storming strategy