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More and more Agile projects are seeking architectural roots as they struggle with complexity and scale - and they're seeking lightweight ways to do it
- Still seeking? In this book�the authors�help you to find your own path
- Taking cues from Lean development,�they can help steer your project toward practices with longstanding track records
- Up-front architecture? Sure. You can deliver an architecture as code that compiles and that concretely guides development without bogging it down in a mass of documents and guesses about the implementation
- Documentation? Even a whiteboard diagram, or a CRC card, is documentation: the goal isn't to avoid documentation, but to document just the right things in just the right amount
- Process? This all works within the frameworks of Scrum, XP, and other Agile approaches
- Sales Rank: #393648 in Books
- Brand: Brand: Wiley
- Published on: 2010-07-26
- Released on: 2010-07-13
- Original language: English
- Number of items: 1
- Dimensions: 9.22" h x .72" w x 7.40" l, 1.67 pounds
- Binding: Paperback
- 376 pages
- Used Book in Good Condition
Review
'...a book of advice that is broad, enabling, and concrete. (Lean Magazine, January 2010).
From the Back Cover
It's time for change - after 30 years, DCI has risen to complete the vision of object-oriented programming!
Aiming at no less than a paradigm shift, Lean Architecture uses a modern approach to software design, while embracing refreshing new insights of Lean and Agile. Giving a down-to-earth view of Agile requirements and the often-ignored relationship between requirements and architecture, this book goes beyond the fashionable idea of User Stories, and shows you how to employ Use Cases in a lightweight, incremental, Agile way. The authors detail the DCI (Data, Context and Interaction) architecture paradigm and show how DCI succeeds where object-oriented programming languages alone have failed to integrate software design with the end user's understanding of the overall business structure.
However, this is not a methodology book, but a book which focuses on code, with plenty of code examples. Topics covered include: Agile production, Stakeholder Engagement, Organizational issues, Scala/Python/Java implementation of the DCI account example, Qi4J and much more.
Renowned software architecture expert James Coplien and agile requirements expert Gertrud Bj�rnvig share their expertise to give you concrete design advice that will help you:
- Create software that builds on your end-user mental models rather than design methodologies
- Write software that can directly be verified against behavioral requirements
- Organize - so that all your stakeholders support each other
- Support rapidly changing feature code in stable domain code to help embrace change
Lean Architecture casts a new light over important aspects of software development that have been marginalized or forgotten by the agile movement – it will help you find your own path.
About the Author
James O. Coplien is a writer, lecturer, and researcher in the field of Computer Science. He has made key contributions in the areas of software design and organizational development, software debugging, and in empirical research. His early work on C++ idioms was one of the three primary sources of the popular Design Patterns. His work on Organizational patterns was an inspiration for both Extreme Programming and for Scrum. Cope was a founding Member of Hillside Group with Kent Beck, Grady Booch, Ward Cunningham, Ralph Johnson, Ken Auer and Hal Hildebrand. He is responsible for starting up several of the conferences in the Pattern Languages of Programming (PLoP) conference series and is a longstanding pattern author and PLoP shepherd.
Gertrud Bjornvig is an experienced software consultant and trainer and has been in software development since 1984. She's been working on development teams as a developer, analyst, and project manager, and has had cross-organizational roles as methodologist and process consultant. Her background is in object-oriented development, including extensive work with UML and RUP. Gertrud has been employed by Enator, Navision, Microsoft, and TietoEnator, but since June 2007 she has been independent as a part of Gertrud & Cope.
Gertrud holds a Master in Computer Science and Communication and is one of the founders of Danish Agile User Group.
Most helpful customer reviews
5 of 5 people found the following review helpful.
this author needs to go back to basics
By Majo2469
This book is so poorly written that it's almost frustrating to read. The author has attempted to make themselves appear more intelligent by using vocabulary that is unsuitable for the sentence structure. I found several grammatical errors. In addition, one of my biggest issues with this book is that the author repeats the same concept several times in the same paragraph as if to almost filled pages of a book by describing the same concept five different ways. I think it's laughable that an instructor has selected this textbook without getting a kickback from the author or publisher.
18 of 24 people found the following review helpful.
A must read for all system developers
By Trygve Reenskaug
This is a different book. Where most books expound a single theme such as Agile, Lean, or Scrum, "Lean Architecture for Agile Software Development" paints on a much broader canvas: Working with the end user, end user's mental model, user requirements, system architecture, and right down to actual code.
This is neither a beginner's "how to do it in ten easy lessons" nor is it a design method. It is a book written for the mature professional by two authors whose long experience has given them a deep understanding of what really matters in practical programming.
At a first glance, many methodologies appear as mere fads, but Coplien and Bj�rnvig see through the fads and build on their real worth to create a thought-provoking and eminently practical book.
Three random jottings from my first reading:
* Architecture: "No matter how we care to define it, software architecture should support the enterprise value stream even to the extent that the source code itself should reflect the end user's mental model of the world."
* Lean secret: "...unite specialists together in one room: everybody, all together, from early on."
* Form and functionality: "System architecture should reflect the end user's mental model of the world. The model has two parts: The first part relates to the user's thought process when viewing the screen, and to what the system is: its form. The second part relates to what end users do - interacting with the system - and how the system should respond to user input. This is the system functionality. We work with users to elicit and develop these models and to capture them in code as early as possible."
The authors claim that an end user should have a picture in his head that enables him to see the commands that are meaningful in a given situation and to understand what they will do for him. This picture, Jim calls it the end user's mental model, it will be reflected into the actual code in well-built systems.
A few years ago, this reviewer introduced a new programming paradigm that he called Data, Context, and Interaction (DCI). The main feature of this paradigm is that it splits the code into two distinct parts. One part specifies system state; the other part specifies system behavior. Coplien and Bj�rnvig use this paradigm to fill in the gap between architecture and code execution. To quote from the book:
* Key building blocks of object-oriented design: "Objects, which are end users' conceptualization of things in their business world; Classes, which provide simple, encapsulated access to the data that represents business information; Roles, which interact in a use case to achieve some business goal."
This book is a MUST read for all who want to understand the true nature of systems development.
3 of 3 people found the following review helpful.
Different
By Stefan
This book is an important contribution in its field. It is interesting, relevant and quite different. Not your typical software architecture book talking about connectors and components and the many classification of the possible combinations between the two. I warmly recommend the material as a fresh, original perspective on software architecture, use cases, requirements, coding. Not convincing enough for a four stars review? this is because I dislike the imperative clich� : "a must read" and also because I realized there is no "silver bullet" architecture book. I like the fact that Agile shows in a "normal" light, not that different from any common sense architecture where waste is not welcome, especially in documentation. Software has the unique feature of documenting itself, why try to duplicate that? In fact "Dispelling agile myths" is the title of a chapter.
It is refreshing to be reminded that OO is not only about subclassing and polymorphism, but one of its initial intent was having same mental (OO) model with your business partners.
I can see how it might not satisfy the most pragmatic programmers (and yes I am aware of the apparent contradiction: "lean and agile are for pragmatic developers!") Ample references are made to a topic carried on from an earlier book: Organizational Patterns, which is basically software architecture reflected in people interactions. Many techniques, habits, narratives, analogies or rules of thumb contribute to the originality of the material and the definition of the elusive features of software architecture.
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