Domain-driven design (DDD) is too often mistaken for just having an object-oriented model that mimics the behavior of the business domain. Not that having such a model is wrong or out of place; it’s just that there’s much more than that in DDD. DDD is primarily a method for understanding and managing the complexity of monumentally large and rich domains. In similar situations, a faithful domain model is not just appropriate but a true lifesaver. In all other (more common) situations, the value of DDD lies elsewhere and overall DDD is much closer to the idea of microservices and CQRS than domain modeling and O/RM frameworks. To make its point the workshop is based on four modules. First, it discusses common patterns for implementing the business logic and relates them to data access and layered architectures. It then introduces the value of keeping command and query stacks separated and how the persistence patterns that best fit. Finally, we expand on the DDD patterns of domain analysis (ubiquitous language and bounded context) and reach the territory of microservices and issues and opportunities available there.

1. UX-DRIVEN
DESIGN
(and I didn’t know)
@despos facebook.com/naa4e Press
DINO
ESPOSITO

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The user of the software won’t know what
she wants until she sees the software.
Humphrey’s Law
An interactive system can never be fully
specified nor can it ever be fully tested.
Wegner’s Lemma

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MAKING SURE IT
WORKS IS HARD
ENOUGH TO
EVER BOTHER
ABOUT DESIGN.

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DO THINGS RIGHT
AND POSTPONE
LEARNING ABOUT
THE RIGHT THING.

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DOING THINGS RIGHT?

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Presentation
Business
Data
How You See Your System How Users See Your System
Interface
BLACK
MAGIC

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DOING THINGS RIGHT?

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Presentation
Business
Data
How You See Your System How Users See Your System
Interface
BLACK
MAGIC
DOING THINGS RIGHT

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USER INTERFACE

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Anonymous
If you wait until the last minute to
complete the user interface, it only takes
a minute.

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Many great ideas have been first
sketched out on paper napkins.

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Visual immediacy
Missed points caught earlier
Focus on tasks and actions
Frontend and backend match up

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INVOICE
ISSUED
EMAIL
CUSTOMER
in 3
WEEKS
WHAT
DOES IT
MEAN???
SHOULD
WE SWAP
THESE?
NEED
MONITORING
CRITICAL
NOTES
ALERT
NOTES
ACTIONS
DOMAIN
EVENTS
Can’t be
changed
anymore
NEED
GREAT
UI HERE

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Two Architect Roles
Collect usability requirements to
build the best possible UX for
the presentation layer
Collect business requirements
to build the best possible
domain layer
Software
Architect
Faces the painful truth of
requirements
UX
Architect
Faces the blissful simplicity
of visuals
Remember: all I'm offering is the truth. Nothing more.
—Morpheus (from “The Matrix”)

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Architecture of the information
User-machine interaction
Usability reviews
Responsibilities of
UX architects
■ Record users in action
■ Analyze body language
■ Monitor timing of operations

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UXDD in Three Steps
Create screens as
users love them
Trigger workflows
from screens
Code workflows to
use business logic

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Two-phase waterfall
Low-cost design of the frontend
Straight implementation of the backend
 Longer than classic bottom-up
 Nearly no post-deployment costs
UXDD
Summary

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UXDD
Summary
NO POST-DEPLOYMENT COSTS?
NO POST-DEPLOYMENT COSTS.

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PRESENTATION
APPLICATION
DOMAIN
INFRASTRUCTURE
DEVELOPER USER/DESIGNER REAL-WORLD
UXDD

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The experience users go through while
interacting with the application.
User Experience

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SKETCH
Freehand drawing
primarily done to jot
down ideas
Related Terminology
WIREFRAME
More precise sketch
focused on layout,
navigation, content
MOCKUP
As detailed as a
wireframe with some
sample UI attached

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PROOF OF CONCEPT
Small exercise to verify
truthfulness or viability of
an assumption
Related Terminology
PROTOTYPE
Fake system simulating
the behavior of the real
system to be built
PILOT
Production-ready system
tested against a subset of
the intended audience

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Sketches
Wireframes
Prototypes
Basic understanding
Basic prototyping
Advanced
prototyping
UXDD Prototyping Levels

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DATA MODEL
BUSINESS LOGIC
USER INTERFACE
Possible model mismatch
BOTTOM-UP
REQUIREMENTS

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TOP-DOWN
DATA MODEL
BUSINESS LOGIC
USER INTERFACE
Model cut to fit
REQUIREMENTS

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TOP-DOWN
DATA MODEL
BUSINESS LOGIC
USER INTERFACE
Model cut to fit
REQUIREMENTS

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TOP-DOWN
BLACK MAGIC
USER INTERFACE
REQUIREMENTS
Model cut to fit

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USER INTERFACE
SCREEN SCREENSCREEN
APPLICATION LAYER
WORK
FLOW
WORK
FLOW
WORK
FLOW
DOMAIN LAYER
INFRASTRUCTURE LAYER
VIEW modelINPUT model
The UX users want
Backend to support
just the UX users want

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UXDD
IN OTHER WORDS …
is yet another
DD thing!!!

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@despos