BA and Beyond 19 - Yves Lorphelin - Strategic domain driven design

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Domain Driven Design is gaining traction in our business. Unfortunately the strategic part is often overlooked, even though it is at the heart of the practice, and is what helps forming a better relationship and understanding between Business, Analysts & Development. This session will highlight some of the strategic aspects: - Problem & Solution Space - Context & Bounded Context - Context Map - Ubiquitous Language They will be illustrated using the current HR domain I'm in : Comparative Selections in government. More precisely, the different meanings of Psychometric Test in the different systems will be explored.

Business

Strategic
Domain Driven Design
BA-Beyond 2019
Yves Lorphelin

Why does it matter ?
It’s developer (mis)understanding, not expert
knowledge that gets released in production
Alberto Brandolini

Why does it matter ?
Learning is the bottleneck
Alberto Brandolini

Strategic Challenges ?
Local & Global Complexity
Coupling & Bottlenecks
Political constraints
Technical Constraints
Consistency
(Anti)Fragile
…

Definitions
•Domain
A sphere of knowledge, influence, or activity. The
subject area to which the user applies a program
is the domain of the software.
•Model
A system of abstractions that describes selected
aspects of a domain and used to solve problems
related to that domain.

Bounded Contexts
Arbitrary Boundaries in the solution space

Bounded Contexts
“…delimits the applicability of a particular model
so that team members have a clear and shared
understanding of what has to be consistent and
how it relates to other contexts"

Bounded Contexts & Context Map
Maps out the CURRENT landscape
Has your team Point of view
Evolves as needed
A trigger for inter-team communication

Bounded Contexts
"political relationships between teams often
determine how systems are integrated. A
technically advantageous unification may be
impossible because of reporting structure"

Bounded Contexts: Even Further
Sociotechnical Architecture Patterns
Team Topologies

Bounded Contexts: Even Further
Ideal : Align Bounded Context and Sub domain

Ubiquituous Language
A language structured around
the domain model and used by all team
members within a bounded context to connect all
the activities of the team with the software.

References
https://ntcoding.co.uk/sociotechnical
https://www.dddheuristics.com

Contact
/in/yves-Lorphelin
@ylorph
Yves Lorphelin
https://www.spikes.be

2 Weeks ago : External Auditors
What did they understood ?

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