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Domain Driven Design: A Step by Step Guide

There is a lot of interest in DDD recently, both in the book, and in the methodology, and in the buzzword.

As a book and methodology, DDD is an excellent way to approach complex software problems, and make them far more understandable and manageable. As a buzzword, DDD is in danger of being corrupted like many other good software practices.

To try and clear up some of the confusion around DDD, I am intending to start a series of short blog posts, covering aspects of DDD and trying to demystify it.

Domain Driven Design is actually pretty simple. It really isn’t that hard. That said, developers seem to have a hard time grasping it. I put this down to a great deal of inexperience, with many people who have just read the book in a cursory way saying “we are doing domain driven design” – these people then confuse the issue for others.

Very few people could claim to have done full-on-balls-to-the-wall DDD, due to the relative “newness” of the book, and the time the ideas it contain talk to peculate down. In addition I work in the .Net space, where DDD has taken longer to penetrate than the Java space where the book was formed. I have practiced DDD in some way on three live projects, to a lesser degree in some aspects, and closer to the “one true way” in others. So, like almost everyone doing DDD, I am no expert, beware anyone that claims they are.

That said, some of the “community” have done more with DDD than others. Their wisdom is well worth picking up along the way – with no specific favouritism or deliberate omission, I heartily recommend you read stuff by Jimmy Nilsson, Greg Young, Colin Jack, Udi Dahan and of course Eric Evans.

Some take the book, Domain-Driven Design: Tackling Complexity in the Heart of Software, to be “the one true bible”, but like everything in software, it is only a good starting point. That said, if you are stepping into DDD with more than a gentle dip in the water, this book will prove to be a very solid basis for going forward without drowning – I recommend it strongly.

For a quicker introduction, I recommend (and have done so in the past), downloading the InfoQ eBook Domain Driven Design Quickly. This distillation of Eric’s work provides a really strongly overview of what DDD is, and how it can help you.

When you remember that DDD is really just “OO software done right”, it becomes more obvious that strong OO experience will also stand you in good stead when approaching DDD. To do my part, I am intending to start a series of blog posts covering various aspects of DDD, to try and make DDD seem somewhat more approachable, and hopefully to try and show that DDD is a whole lot simpler than many make it appear.


Posted 02-09-2009 8:21 AM by Jak Charlton

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Comments

DotNetKicks.com wrote Domain Driven Design
on 02-09-2009 3:53 AM

You've been kicked (a good thing) - Trackback from DotNetKicks.com

Ollie Riches wrote re: Domain Driven Design: A Step by Step Guide
on 02-09-2009 6:06 AM

My english is not that good could you explain what  'balls-to-the-wall' means?

DotNetShoutout wrote Domain Driven Design: A Step by Step Guide - Casey Charlton - Insane World
on 02-09-2009 6:10 AM

Thank you for submitting this cool story - Trackback from DotNetShoutout

DDD: The Ubiquitous Language - Casey Charlton - Insane World wrote DDD: The Ubiquitous Language - Casey Charlton - Insane World
on 02-09-2009 7:01 AM

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on 02-09-2009 7:27 AM

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John Collins wrote re: Domain Driven Design: A Step by Step Guide
on 02-09-2009 8:12 AM

Ollie,  the phrase "balls-to-the-wall" came from fighter pilots when they pushed the throttle stick (which had a little ball on top) all the way to the wall of the cockpit to go as fast as possible.

Dew Drop - February 9, 2009 | Alvin Ashcraft's Morning Dew wrote Dew Drop - February 9, 2009 | Alvin Ashcraft's Morning Dew
on 02-09-2009 9:20 AM

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Domain Driven Design: A Step by Step Guide - Casey Charlton … | cheapdirtdomain.com wrote Domain Driven Design: A Step by Step Guide - Casey Charlton … | cheapdirtdomain.com
on 02-09-2009 10:55 AM

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Reflective Perspective - Chris Alcock » The Morning Brew #283 wrote Reflective Perspective - Chris Alcock » The Morning Brew #283
on 02-10-2009 3:31 AM

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Chris Browne wrote re: Domain Driven Design: A Step by Step Guide
on 02-10-2009 11:04 AM

really looking forward to the blog posts casey.

i'm reading evans ddd at the moment, and i'm dead interested in reading more about it.

new 维生素C.net() wrote 关于Domain Driven Desing的两篇简单易懂的文章
on 02-10-2009 12:35 PM
on 02-10-2009 3:11 PM

WCF/CSD/Azure I know I wrote about the "broken WCF and IDisposable" problem before and how we dealt with it at Neudesic but I can't find it/them with Google. Here is a pointer to David Barrett's (Neudesic) post about how we talked about it and

on 02-10-2009 3:14 PM

WCF/CSD/Azure I know I wrote about the "broken WCF and IDisposable" problem before and how we dealt with it at Neudesic but I can't find it/them with Google. Here is a pointer to David Barrett's (Neudesic) post about how we talked about it and

DDD: Bounded Contexts - Casey Charlton - Insane World wrote DDD: Bounded Contexts - Casey Charlton - Insane World
on 02-11-2009 4:28 AM

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DDD: There Is No Database - Casey Charlton - Insane World wrote DDD: There Is No Database - Casey Charlton - Insane World
on 02-12-2009 2:27 AM

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on 02-12-2009 3:11 AM

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Casey Charlton - Insane World wrote DDD: A Short Interlude
on 02-12-2009 10:19 AM

Ya know, I blog partly because I like the sound of my own voice, and partly because I like to try and

Community Blogs wrote DDD: A Short Interlude
on 02-12-2009 10:39 AM

Ya know, I blog partly because I like the sound of my own voice, and partly because I like to try and

DDD : Command Query Separation as an Architectural Concept - Casey Charlton - Insane World wrote DDD : Command Query Separation as an Architectural Concept - Casey Charlton - Insane World
on 02-12-2009 12:13 PM

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DDD : Command Query Separation as an Architectural Concept - Casey Charlton - Insane World wrote DDD : Command Query Separation as an Architectural Concept - Casey Charlton - Insane World
on 02-12-2009 12:23 PM

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Domain Driven Design: A Step by Step Guide - Casey Charlton - Insane World - DotNetBurner wrote Domain Driven Design: A Step by Step Guide - Casey Charlton - Insane World
on 02-12-2009 8:12 PM

DotNetBurner.com - news and articles about .net DotNetBurner

DDD: Entities and Value Objects - Casey Charlton - Insane World wrote DDD: Entities and Value Objects - Casey Charlton - Insane World
on 02-13-2009 10:19 AM

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on 02-13-2009 10:56 AM

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DDD: Where is the Code? Another Brief Interlude - Casey Charlton - Insane World wrote DDD: Where is the Code? Another Brief Interlude - Casey Charlton - Insane World
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DDD: Aggregates and Aggregate Roots - Casey Charlton - Insane World wrote DDD: Aggregates and Aggregate Roots - Casey Charlton - Insane World
on 02-16-2009 9:50 AM

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DDD: Services - Casey Charlton - Insane World wrote DDD: Services - Casey Charlton - Insane World
on 02-17-2009 4:38 PM

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on 02-17-2009 4:44 PM

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DDD: What Kind of Applications Is It Suited To? - Casey Charlton - Insane World wrote DDD: What Kind of Applications Is It Suited To? - Casey Charlton - Insane World
on 02-18-2009 2:20 PM

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DDD: The Repository Pattern - Casey Charlton - Insane World wrote DDD: The Repository Pattern - Casey Charlton - Insane World
on 02-20-2009 3:30 AM

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DDD: Living In The Enterprise - Casey Charlton - Insane World wrote DDD: Living In The Enterprise - Casey Charlton - Insane World
on 02-21-2009 4:25 AM

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DDD: Living In The Enterprise - Casey Charlton - Insane World wrote DDD: Living In The Enterprise - Casey Charlton - Insane World
on 02-21-2009 4:48 AM

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on 02-21-2009 10:42 AM

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DDD: The Repository Pattern - Insane World - Insane World wrote DDD: The Repository Pattern - Insane World - Insane World
on 02-21-2009 10:42 AM

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DDD: Bounded Contexts - DDD Step By Step - DDD: Step By Step wrote DDD: Bounded Contexts - DDD Step By Step - DDD: Step By Step
on 02-22-2009 3:32 PM

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DDD: There Is No Database - DDD Step By Step - DDD: Step By Step wrote DDD: There Is No Database - DDD Step By Step - DDD: Step By Step
on 02-22-2009 3:32 PM

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DDD : Command Query Separation as an Architectural Concept - DDD Step By Step - DDD: Step By Step wrote DDD : Command Query Separation as an Architectural Concept - DDD Step By Step - DDD: Step By Step
on 02-22-2009 3:33 PM

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DDD: Entities and Value Objects - DDD Step By Step - DDD: Step By Step wrote DDD: Entities and Value Objects - DDD Step By Step - DDD: Step By Step
on 02-22-2009 3:34 PM

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DDD: Aggregates and Aggregate Roots - DDD Step By Step - DDD: Step By Step wrote DDD: Aggregates and Aggregate Roots - DDD Step By Step - DDD: Step By Step
on 02-22-2009 3:34 PM

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DDD: Services - DDD Step By Step - DDD: Step By Step wrote DDD: Services - DDD Step By Step - DDD: Step By Step
on 02-22-2009 3:35 PM

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DDD: What Kind of Applications Is It Suited To? - DDD Step By Step - DDD: Step By Step wrote DDD: What Kind of Applications Is It Suited To? - DDD Step By Step - DDD: Step By Step
on 02-22-2009 3:36 PM

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DDD: The Repository Pattern - DDD Step By Step - DDD: Step By Step wrote DDD: The Repository Pattern - DDD Step By Step - DDD: Step By Step
on 02-22-2009 3:36 PM

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DDD: Living In The Enterprise - DDD Step By Step - DDD: Step By Step wrote DDD: Living In The Enterprise - DDD Step By Step - DDD: Step By Step
on 02-22-2009 3:37 PM

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#.think.in wrote #.think.in infoDose #18 (26th Jan - 20th Feb)
on 02-23-2009 12:45 AM

#.think.in infoDose #18 (26th Jan - 20th Feb)

DDD: Living In The Enterprise - Insane World - DDD Step By Step wrote DDD: Living In The Enterprise - Insane World - DDD Step By Step
on 02-26-2009 4:08 PM

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DDD: The Repository Pattern - Insane World - DDD Step By Step wrote DDD: The Repository Pattern - Insane World - DDD Step By Step
on 02-26-2009 4:08 PM

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DDD: What Kind of Applications Is It Suited To? - Insane World - DDD Step By Step wrote DDD: What Kind of Applications Is It Suited To? - Insane World - DDD Step By Step
on 02-26-2009 4:08 PM

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Domain Driven Design: A Step by Step Guide « evolving-software.co.uk wrote Domain Driven Design: A Step by Step Guide « evolving-software.co.uk
on 03-18-2009 4:36 PM

Pingback from  Domain Driven Design: A Step by Step Guide «  evolving-software.co.uk

Jared wrote re: Domain Driven Design: A Step by Step Guide
on 12-04-2009 8:48 AM

So where is this step by step guide? Or at the very least a brief overview of what DDD is and the problems it is attempting to solve? You just wrote 10 paragraphs saying absolutely nothing. Typical American.

Jak wrote re: Domain Driven Design: A Step by Step Guide
on 12-04-2009 9:51 AM

Dear Jared

a) I'm British

b) This posts says this is the first in a series of posts (all of which are on this site if you cared to look)

c) Check dddstepbystep.co.uk to find all of them, the guide as a PDF, a glossary, and a sample application specification

/slap

Remco Ros' blog wrote Note to self: read some more about Domain Driven Design
on 02-25-2010 8:08 AM

Note to self: read some more about Domain Driven Design

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