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Domain-Driven Design: Tackling Complexity in the Heart of Software Hardcover – Aug 20 2003

4.3 out of 5 stars 18 customer reviews

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Product Details

  • Hardcover: 560 pages
  • Publisher: Addison-Wesley Professional; 1 edition (Aug. 20 2003)
  • Language: English
  • ISBN-10: 0321125215
  • ISBN-13: 978-0321125217
  • Product Dimensions: 18.8 x 3.8 x 23.6 cm
  • Shipping Weight: 1.2 Kg
  • Average Customer Review: 4.3 out of 5 stars 18 customer reviews
  • Amazon Bestsellers Rank: #52,408 in Books (See Top 100 in Books)
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Product Description

From the Inside Flap

Leading software designers have recognized domain modeling and design as critical topics for at least twenty years, yet surprisingly little has been written about what needs to be done or how to do it. Although it has never been clearly formulated, a philosophy has developed as an undercurrent in the object community, which I call "domain-driven design".

I have spent the past decade focused on developing complex systems in several business and technical domains. I've tried best practices in design and development process as they have emerged from the leaders in the object-oriented development community. Some of my projects were very successful; a few failed. A feature common to the successes was a rich domain model that evolved through iterations of design and became part of the fabric of the project.

This book provides a framework for making design decisions and a technical vocabulary for discussing domain design. It is a synthesis of widely accepted best practices along with my own insights and experiences. Projects facing complex domains can use this framework to approach domain-driven design systematically.

Contrasting Three ProjectsThree projects stand out in my memory as vivid examples of the dramatic effect domain design practice has on development results. Although all three delivered useful software, only one achieved its ambitious objectives and delivered complex software that continued to evolve to meet ongoing needs of the organization.

I watched one project get out of the gate fast with a useful, simple web-based trading system. Developers were flying by the seat of their pants, but simple software can be written with little attention to design. As a result of this initial success, expectations for future development were sky-high. It was at this point that I was approached to work on the second version. When I took a close look, I saw that they lacked a domain model, or even a common language on the project, and were saddled with an unstructured design. So when the project leaders did not agree with my assessment, I declined the job. A year later, they found themselves bogged down and unable to deliver a second version. Although their use of technology was not exemplary, it was the business logic that overcame them. Their first release had ossified prematurely into a high-maintenance legacy.

Lifting this ceiling on complexity calls for a more serious approach to the design of domain logic. Early in my career, I was fortunate to end up on a project that did emphasize domain design. This project, in a domain at least as complex as the one above, also started with a modest initial success, delivering a simple application for institutional traders. But this delivery was followed up with successive accelerations of development. Each successive iteration opened exciting new options for integration and elaboration of functionality. The team way able to respond to the needs of the traders with flexibility and expanding capability. This upward trajectory was directly attributable to an incisive domain model, repeatedly refined and expressed in code. As the team gained new insight into the domain, the model deepened. The quality of communication improved among developers and between developers and domain experts, and the design, far from imposing an ever-heavier maintenance burden, became easier to modify and extend.

Unfortunately, not all projects that start with this intention manage to arrive at this virtuous cycle. One project I joined started with lofty aspirations to build a global enterprise system based on a domain model, but finally had a disappointing result. The team had good tools, a good understanding of the business and gave serious attention to modeling. But a separation of developer roles led to a disconnect between the model and implementation, so the design did not reflect the deep analysis that was going on. In any case, the design of detailed business objects was not rigorous enough to support combining them in elaborate applications. Repeated iteration produced no improvement in the code, due to uneven skill-level among developers with no clear understanding of the particular kind of rigor needed. As months rolled by, development work became mired in complexity and the team lost its cohesive vision of the system. After years of effort, the project did produce modest, useful software, but had given up the early ambitions along with the model focus.

Of course many things can put a project off course, bureaucracy, unclear objectives, lack of resources, to name a few, but it is the approach to design that largely determines how complex software can become. When complexity gets out of hand, the software can no longer be understood well enough to be easily changed or extended. By contrast, a good design can make opportunities out of those complex features.

Some of these design factors are technological, and a great deal of effort has gone into the design of networks, databases, and other technical dimension of software. Books have been written about how to solve these problems. Developers have cultivated their skills.

Yet the most significant complexity of many applications is not technical. It is in the domain itself, the activity or business of the user. When this domain complexity is not dealt with in the design, it won't matter that the infrastructural technology is well-conceived. A successful design must systematically deal with this central aspect of the software.

The premise of this book is that

  1. For most software projects, the primary focus should be on the domain and domain logic.
  2. Complex domain designs should be based on a model.
  3. Domain-driven design is a way of thinking and a set of priorities, aimed at accelerating software projects that have to deal with complicated domains. To accomplish that goal, this book presents an extensive set of design practices, techniques and principles.
Design vs. Development ProcessDesign books. Process books. They seldom even reference each other. Each is a complex topic in its own right. This is a design book. But I believe that these two issues are inextricable if design concepts are to be put into successful practice and not dry up into academic discussion. When people learn design techniques, they feel excited by the possibilities, but then the messy realities of a real project descend on them. They don't see how to fit the new design ideas with the technology they must use. Or they don't know when to worry about a particular design aspect and when to let go in the interest of time. While it is possible to talk with other team members about the application of a design principle in the abstract, it is more natural to talk about the things we do together. So, while this is a design book, I'm going to barge right across that artificial boundary when I need to. This will place design in the context of a development process.

This book is not specific to a particular methodology, but it is oriented toward the new family of "Agile Development Processes". Specifically, it assumes a couple of process practices are in place on the project. These two practices are prerequisites for applying the approach in this book.

  • Iterative development. The practice of iterative development has been advocated and practiced for decades, and is a corner stone of the Agile development methods. There are many good discussions in the literature of Agile development and Extreme Programming, among them, Cockburn1998 and Beck 1999.
  • A close relationship between developers and domain experts. Domain-driven design crunches a huge amount of knowledge into a model that reflects deep insight into the domain and a focus on the key concepts. This is a collaboration between those who know the domain and those who know how to build software. Because it is iterative, this collaboration must continue throughout the project's life.
Extreme Programming (XP), conceived by Kent Beck, Ward Cunningham and others Beck2000, is the most prominent of the agile processes and the one I have worked with most. To make the discussion concrete, I will use XP throughout the book as the basis for discussion of the interaction of design and process. The principles illustrated are easily adapted to other Agile Processes.

In recent years there has been a rebellion against elaborate development methodologies that burden projects with useless, static documents and obsessive upfront planning and design. Instead, the Agile Processes, such as XP, emphasize the ability to cope with change and uncertainty.

XP recognizes the importance of design decisions, but strongly resists upfront design. Instead, it puts an admirable effort into increasing communication, and increasing the project's ability to change course rapidly. With that ability to react, developers can use the "simplest thing that could work" at any stage of a project and then continuously refactor, making many small design improvements, ultimately arriving at a design that fits the customer's true needs.

This has been a much-needed antidote to some of the excesses of design enthusiasts. Projects have bogged down in cumbersome documents that provided little value. They have suffered "analysis paralysis", so afraid of an imperfect design that they made no progress at all. Something had to change.

Unfortunately, some of these new process ideas can be easily misinterpreted. Each person has a different definition of "simplest". Continuous refactoring without design principles to guide these small redesigns developers can produce a code base hard to understand or change - the opposite of agility. And, while fear of unanticipated requirements often leads to over-engineering, the attempt to avoid over-engineering can develop into another fear: The fear of any deep design thinking at all.

In fact, XP works best for developers with a sharp design sense. The XP process assumes that you can improve a design by refactoring, and that you will do this often and rapidly. But design choices make refactoring itself easier or harder. The XP process attempts to increase team communication. But model and design choices clarify or confuse communication. What is needed is an approach to domain modeling and design that pulls its weight.

This book intertwines design and development practice and illustrates how domain-driven design and agile development reinforce each other. A sophisticated approach to domain modeling within the context of an agile development process will accelerate development. The interrelationship of process with domain development makes this approach more practical than any treatment of "pure" design in a vacuum.

The Structure of This BookThe book is divided into four major sections:

Part I: Putting the Domain Model to Work presents the basic goals of domain-driven development that motivate the practices in later sections. Since there are so many approaches to software development, Part I defines terms, and gives an overview of the implications of placing the domain model in the role of driving communication and design.

Part II: The Building Blocks of Model-driven Design condenses a core of best practices in object-oriented domain modeling into a set of basic building blocks. The focus of this section is on bridging the gap between models and practical, running software. Sharing these standard patterns brings order to the design and makes it easy for team members to understand each other's work. Using standard patterns also establishes a common language, which all team members can use to discuss model and design decisions.

But the main point of this section is on the kind of decisions that keep the model and implementation aligned with each other, reinforcing each other's effectiveness. This alignment requires attention to the detail of individual elements. Careful crafting at this small scale gives developers a steady platform to apply the modeling approaches of Parts III and IV.

Part III: Refactoring Toward Deeper Insight goes beyond the building blocks to the challenge of assembling them into practical models that provide the payoff. Rather than jumping directly into esoteric design principles, this section emphasizes the discovery process. Valuable models do not emerge immediately. They require a deep understanding of the domain. That understanding comes from diving in, implementing an initial design based on a probably naive model, and then transforming it again and again. Each time the team gains insight, the model is transformed to reveal that richer knowledge, and the code is refactored to reflect the deeper model and make it's potential available to the application. Then, once in a while, this onion pealing leads to an opportunity to break through to a much deeper model, attended by a rush of profound design changes.

Exploration is inherently open-ended, but it does not have to be random. Part III delves into modeling principles that can guide choices along the way, and techniques that help direct the search.

Part IV: Strategic Design deals with situations that arise in complex systems, larger organizations, interactions with external systems and legacy systems. This section explores a triad of principles that apply to the system as a whole: Bounded Context, Distillation, and Large-Scale Structure. Strategic design decisions are made by teams, or even between teams. Strategic design enables the goals of Part I to be realized on a larger scale, for a big system or in an application that fits in an enterprise-wide network.

Throughout the book, discussions are illustrated with realistic examples, drawn from actual projects, rather than oversimplified "toy" problems.

Much of the book is written as a set of "patterns." The reader should be able to fully understand the material without concern about this device, but those who are interested in the style and format of the patterns can read Appendix A.

Who This Book Is Written ForThis book is primarily written for developers of object-oriented software. Most members of a software project team can benefit from some parts of it. It will make most sense to people who are on a project, trying to do some of these things as they go through, or who have deep experience already to relate it to.Some knowledge of object-oriented modeling is necessary to benefit from this book. The examples include UML diagrams and Java code, so the ability to read those languages at a basic level is important, but it is unnecessary to have mastered the details of either UML or Java. Knowledge of Extreme Programming will add perspective to the discussions of development process, but the discussion should be understandable without background knowledge.

For an intermediate software developer, a reader who already knows something of object-oriented design and may have read one or two software design books, this book will fill in gaps and provide perspective on how object modeling fits into real life on a software project. It will help an intermediate developer make the jump to applying sophisticated modeling and design skills to practical problems.An advanced or expert software developer should be interested in the comprehensive framework for dealing with the domain. The systematic approach to design will help them in leading teams down this path. The coherent terminology will help them communicate with peers.

Readers of various backgrounds may wish to take different paths through the book, shifting emphasis to different points. I recommend all readers to start with the introduction to Part I, and Chapter 1. This book is a narrative, and can be read beginning to end, or from the beginning of any chapter. A skimmer who already has some grasp of a topic should be able to pick up the main points by reading headings and bolded text. A very advanced reader may want to skim Parts I and II, and will probably be most interested in Parts III and IV.

In addition to this core readership, the book will be of interest to analysts and to relatively technical project managers. Analysts can draw on the connection between model and design to make more effective contributions in the context of an "Agile" project. Analysts may also use some of the principles of strategic design to better focus and organize their work.

Project managers should be interested in the emphasis on making a team more effective and more focused on designing software meaningful to business experts and users. And, since, strategic design decisions are interrelated with team organization and work styles, these design decisions necessarily involve the leadership of the project, and have a major impact on the project's trajectory.

While an individual developer who understands domain-driven design will gain valuable design techniques and perspective, the biggest gains come when a team joins to apply a domain-driven design approach and move the domain model to the center of discourse of the project. The team members will share a language that enriches their communication and keeps it connected to the software. They will produce an implementation in step with the model, giving leverage to application development. They will share a map of how design work of different teams relates, and will systematically focus attention on the most features most distinctive and valuable to the organization.

A domain-driven design is a difficult technical challenge that can pay off big, opening opportunities just at the stage when most software projects begin to ossify into legacy.

From the Back Cover

“Eric Evans has written a fantastic book on how you can make the design of your software match your mental model of the problem domain you are addressing.

“His book is very compatible with XP. It is not about drawing pictures of a domain; it is about how you think of it, the language you use to talk about it, and how you organize your software to reflect your improving understanding of it. Eric thinks that learning about your problem domain is as likely to happen at the end of your project as at the beginning, and so refactoring is a big part of his technique.

“The book is a fun read. Eric has lots of interesting stories, and he has a way with words. I see this book as essential reading for software developers—it is a future classic.”

     —Ralph Johnson, author of Design Patterns

“If you don’t think you are getting value from your investment in object-oriented programming, this book will tell you what you’ve forgotten to do.

“Eric Evans convincingly argues for the importance of domain modeling as the central focus of development and provides a solid framework and set of techniques for accomplishing it. This is timeless wisdom, and will hold up long after the methodologies du jour have gone out of fashion.”

     —Dave Collins, author of Designing Object-Oriented User Interfaces

“Eric weaves real-world experience modeling—and building—business applications into a practical, useful book. Written from the perspective of a trusted practitioner, Eric’s descriptions of ubiquitous language, the benefits of sharing models with users, object life-cycle management, logical and physical application structuring, and the process and results of deep refactoring are major contributions to our field.”

     —Luke Hohmann, author of Beyond Software Architecture

"This book belongs on the shelf of every thoughtful software developer."

--Kent Beck

"What Eric has managed to capture is a part of the design process that experienced object designers have always used, but that we have been singularly unsuccessful as a group in conveying to the rest of the industry. We've given away bits and pieces of this knowledge...but we've never organized and systematized the principles of building domain logic. This book is important."

--Kyle Brown, author of Enterprise Java™ Programming with IBM® WebSphere®

The software development community widely acknowledges that domain modeling is central to software design. Through domain models, software developers are able to express rich functionality and translate it into a software implementation that truly serves the needs of its users. But despite its obvious importance, there are few practical resources that explain how to incorporate effective domain modeling into the software development process.

Domain-Driven Design fills that need. This is not a book about specific technologies. It offers readers a systematic approach to domain-driven design, presenting an extensive set of design best practices, experience-based techniques, and fundamental principles that facilitate the development of software projects facing complex domains. Intertwining design and development practice, this book incorporates numerous examples based on actual projects to illustrate the application of domain-driven design to real-world software development.

Readers learn how to use a domain model to make a complex development effort more focused and dynamic. A core of best practices and standard patterns provides a common language for the development team. A shift in emphasis--refactoring not just the code but the model underlying the code--in combination with the frequent iterations of Agile development leads to deeper insight into domains and enhanced communication between domain expert and programmer. Domain-Driven Design then builds on this foundation, and addresses modeling and design for complex systems and larger organizations.Specific topics covered include:

  • Getting all team members to speak the same language
  • Connecting model and implementation more deeply
  • Sharpening key distinctions in a model
  • Managing the lifecycle of a domain object
  • Writing domain code that is safe to combine in elaborate ways
  • Making complex code obvious and predictable
  • Formulating a domain vision statement
  • Distilling the core of a complex domain
  • Digging out implicit concepts needed in the model
  • Applying analysis patterns
  • Relating design patterns to the model
  • Maintaining model integrity in a large system
  • Dealing with coexisting models on the same project
  • Organizing systems with large-scale structures
  • Recognizing and responding to modeling breakthroughs

With this book in hand, object-oriented developers, system analysts, and designers will have the guidance they need to organize and focus their work, create rich and useful domain models, and leverage those models into quality, long-lasting software implementations.



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Format: Hardcover
I think that this book along with Robert Martin's "Agile Software Development, Principles, Patterns, and Practices" and Martin Fowler's "Refactoring" are perhaps the three most fundamental prerequisites for making the leap in knowledge and maturity from object-oriented programming to true proficiency in object-oriented design. The books from Martin and Fowler cover the software solution design space and the core principles and patterns for making code that is resilient to change and easy to maintain. Eric Evans book covers the problem domain space and the abstraction skills that free programmers to "break out of the box" of the implementation domain and solution objects into the critical area the business domain and corresponding domain objects.
I once led a young software team and tried to convey the need for and essence of these skills to them, but I didnt have the right words and terms to do it for their level of experience. I wish this book had been available to me then because I think it would have made a real difference for that team.
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Format: Hardcover
I bought this book due in part to the glowing reviews here on Amazon so I feel a duty to inject a bit of skepticism, now that I've read it.
5 stars for a technical book indicates to me a book of profound quality that really breaks through with penetrating insights -- The kind of book that makes me think, "Wow, this book has really brought my development practice into a renewed, sharper focus." It doesn't necessarily have to provide radically new material, but it does have to package whatever material it contains in a way that causes the gears in my head to shift around and reorganize themselves. Design Patterns is such a book. XP Explained is such a book. I don't think this one qualifies.
Some good points: The author makes a good case for agile development/extreme programming (close relationship with the customer, unit tests, refactoring...). He seems to believe there may be a tendency to over-emphasize the importance of code and to neglect design in such practices, which may or may not be true in industry at large. But in any case, his major thesis is that it is also important to consider the overall domain model and how well-aligned it is to the goals of the business. He proposes developing a common ("ubiqitous") language between developers and business users, and to unify the various traditional views of a software system (requirements, analysis model, design model, etc..) into one. The advice is quite wholesome and will hopefully promote bringing some harmony between the agile camp and the adherents of high-ceremony approaches such as RUP and CMM.
Some bad points: The book is rather wordy, and a lot of common-sense ideas are repeated at length. I don't feel that the patterns in the book are much more than re-statements of basic principles of OO design.
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Format: Hardcover
I thoroughly enjoyed Eric's book - a reminder to all of us about the heart of OO design. It is both a vision of how to design with objects, and filled with practical tips for both refactoring towards better models, and creating robust domain layers.
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Format: Hardcover
Even if we're geeks from birth, and grow up playing with tinker toys or legos and graduate to software or electronics and then make it through engineering or software school with high marks, most of us never really encounter extremely complex problems until we are employed in industry. The result is that we are pushing thirty before we encounter problems that we can't simply jump into and starting building the solution for. We end up approaching every problem with tools and materials in hand, neglecting the important problem space analysis that must come first. Evans does a superb job of explaining how OO analysis of the problem domain leads to natural, sensible reflections in the solution space. It may be that there are too many words in this book, and it may be that the ordering is a little off, but the message is dead on, and shouldn't be ignored by anybody who's serious about solving very complex problems with software. If software is part art and part science, this book describes the art very well.
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Format: Hardcover
If the advice and the underlying processes and procedures outlined in this book are followed any software engineering process or lifecycle approach will be dramatically improved. Note that the material in this book is as applicable to agile methods as they are to heavy approaches, including the still used waterfall SDLC.
Why five stars? Because this book peels off the layers of what is wrong with development, discarding them and replacing them with alternatives that promote communications among all stakeholders, placing design into its proper context, and provides the glue that binds subject matter experts from business and technology domains into a cohesive team using the same language and pursuing the same goals. On the surface this seems like common sense, but in practice, it is rarely done. Indeed, the lack of the ingredients given in this book on most projects is the reason why so many projects fail or are cancelled, and why there exists today a real disconnect between IT and the business. Following this book, implementing the practices, and managing to them will make a world of difference in the success rate of any organization, large or small.
I like the copious examples to illustrate the technical concepts, and especially chapters 9 (Making Implicit Concepts Explicit) and 14 (Maintaining Model Integrity) because these are two areas in design that I've observed to be potential failure points - the first because too often wrong assumptions are made and locked in, and the second because models sometimes take on a life of their own and morph into unintended things.
This book emphasizes a number of critical success factors, including knowledge, communication, control and vision.
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