Hands-on: Introduction to Domain Storytelling

Brought to you by Dorota and Stefan (@hofstef) who work
for WPS – Workplace Solutions GmbH in Hamburg and Berlin.

@hofstef @wps_de business gibberish { nerd; speek; } Domain Expert
Software Expert

@hofstef @wps_de Fach- sprache Domain Expert Software Expert

@hofstef @wps_de Thanks to DDD Europe for this awesome picture
of Henning!

Why Domain Storytelling? Today: • Understanding a domain • Reasoning
about sub-domains and bounded contexts There is more: • Deriving domain model • Deriving requirements • Designing new processes • Facilitate change • …

@hofstef @wps_de Schedule 1. Understanding a domain demo – explanation
– exercise – break 2. Domain-Driven Design & finding boundaries demo – explanation – exercise – break 3. Practice 4. Your domain or a real world example

@hofstef @wps_de Demo: Leasing a Car

@hofstef @wps_de

@hofstef @wps_de @hofstef @hschwentner Pictographic Language

@hofstef @wps_de actor work object activity annotation

@hofstef @wps_de Risk manager contract votes

@hofstef @wps_de person people system

@hofstef @wps_de …sends the contract to... ...passes on the contract
to... sends contract passes on to to contract

@hofstef @wps_de The sales person passes on the contract to
the risk manager. passes on contract Risk manager Sales person to

@hofstef @wps_de 1 1 1

@hofstef @wps_de tells whish for Sales person Customer 1 monthly
installment contract car to in 2

@hofstef @wps_de tells whish for Sales person Customer 1 monthly
installment contract car to in 2 contract 3

@hofstef @wps_de CONCRETE STORIES VS. ABSTRACT PROCESSES

@hofstef @wps_de 3 good examples are better than 1 bad
abstraction

@hofstef @wps_de Draw here Leave some empty space there →
Annotations, variations, and purpose Preconditions, assumptions, and triggers

@hofstef @wps_de Workshops

@hofstef @wps_de

@hofstef @wps_de Whiteboard Kit Picture: W. Kinkeldei @wkinkeldei

@hofstef @wps_de

@hofstef @wps_de PowerPoint, yEd, Viso, gliphy… asks for Reservation (movie,
time, seats) cashier customer 1 Screen plan finds available seats in CineSoft 2 seats recommends 3

@hofstef @wps_de github.com/WPS/domain-story-modeler

@hofstef @wps_de

@hofstef @wps_de eBook and free sample available at: https://leanpub.com/domainstorytelling Get
a discount using the link: http://leanpub.com/domainstorytelling/c/saconf

@hofstef @wps_de If you speak German: Take a free bruchure!
And grab a sticker:

@hofstef @wps_de Twitter: @hofstef @hschwentner #DomainStorytelling Slides: https://speakerdeck.com/hofstef Book: https://leanpub.com/domainstorytelling
Slack: ddd-cqrs-es.slack.com Invite yourself: http://j.mp/ddd-es-cqrs Slack Channel: #domain-storytelling http://domainstorytelling.org The pictures used in this talk are public domain, unless noted otherwise. Screenshots and examples © WPS - Workplace Solutions GmbH

@hofstef @wps_de A Quick Introduction to Domain-Driven Design

@hofstef @wps_de

@hofstef @wps_de Domain Knowledge

@hofstef @wps_de Blue Book Red Book 2015 ’16 ’17 ’14
’13 ’12 2010 ’11 ’09 ’08 ’07 ’06 2005 ’04 ’03 ’02 2000 01 ’99 ’98

Strategic Design Ubiquitous Language Tactical Design Eric Evans, 2003 Picture:
Martin Schimak @martinschimak Paul Rayner, DDD Explore 2018 + Ubiquitous Language as an overarching principle DDD 2003 vs. DDD 2018

@hofstef @wps_de Demo: Leasing a Car

@hofstef @wps_de

One Domain – Multiple Models Foto: Maiconfz/pixabay/CCO Foto: Globus from
book shelf/wikipedia/ CC-BY-3.0 Foto:Clker-Free-Vector-Images/pixabay/ CCO Foto: Wasserseemüller-Globus/Wikipedia/CC-PD-Mark

@hofstef @wps_de Bounded Context: A coherent model with an unambiguous
language.

@hofstef @wps_de general ledger accounting Sales Payroll accounting HR Subdomain
Bounded Context

Sub-domain vs. Bounded Context • Ideally, there is a 1:1
relation between sub-domain and bounded context (at least for your core sub-domains). • In real life, there is a trade-off between • Business process/domain • Organizational structure • Business value • Technical constraints • User experience • … • Legacy systems are often unbounded Foto: Dreibund Medaille/Wikipedia/CC BY-SA 3.0

@hofstef @wps_de Heuristic: Look for activities that - from an
actor’s perspective - belong together.

@hofstef @wps_de Activities that belong together:

@hofstef @wps_de Indicator: only one actor involved xyz context

@hofstef @wps_de Indicator: one-way information flow abc context xyz context

@hofstef @wps_de Indicator: different triggers abc context xyz context

@hofstef @wps_de Navigating Officer Captain route puts 1 2 ship
shilhouette depth map on Cartographer MANEUVER PLANNING (BIG PICTURE)

@hofstef @wps_de Navigating Officer Captain route puts ship shilhouette depth
map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map MANEUVER PLANNING (BIG PICTURE) (1-5) daily

@hofstef @wps_de puts Navigating Officer Captain route 7 ship shilhouette
depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available

depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available maneuver planning (sub-domain)

depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available ?

Hands-on: Introduction to Domain Storytelling

Hands-on: Introduction to Domain Storytelling

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