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The new concept of Extreme Programming (XP) is gaining more and more acceptance, partially because it is controversial, but primarily because it is particularly well-suited to help the small software development team succeed. This book serves as the introduction to XP that the market will need. XP is controversial, many software development sacred cows don't make the cut in XP; it forces practitioners to take a fresh look at how software is developed. The author recognizes that this "lightweight" methodology is not for everyone. However, anyone interested in discovering what this new concept can offer them will want to start with this book.
- Sales Rank: #759918 in Books
- Published on: 1999-10-05
- Original language: English
- Number of items: 1
- Dimensions: 9.26" h x .44" w x 7.34" l,
- Binding: Paperback
- 224 pages
Amazon.com Review
Kent Beck's eXtreme Programming eXplained provides an intriguing high-level overview of the author's Extreme Programming (XP) software development methodology. Written for IS managers, project leaders, or programmers, this guide provides a glimpse at the principles behind XP and its potential advantages for small- to mid-size software development teams.
The book intends to describe what XP is, its guiding principles, and how it works. Simply written, the book avoids case studies and concrete details in demonstrating the efficacy of XP. Instead, it demonstrates how XP relies on simplicity, unit testing, programming in pairs, communal ownership of code, and customer input on software to motivate code improvement during the development process. As the author notes, these principles are not new, but when they're combined their synergy fosters a new and arguably better way to build and maintain software. Throughout the book, the author presents and explains these principles, such as "rapid feedback" and "play to win," which form the basis of XP.
Generally speaking, XP changes the way programmers work. The book is good at delineating new roles for programmers and managers who Beck calls "coaches." The most striking characteristic of XP is that programmers work in pairs, and that testing is an intrinsic part of the coding process. In a later section, the author even shows where XP works and where it doesn't and offers suggestions for migrating teams and organizations over to the XP process.
In the afterword, the author recounts the experiences that led him to develop and refine XP, an insightful section that should inspire any organization to adopt XP. This book serves as a useful introduction to the philosophy and practice of XP for the manager or programmer who wants a potentially better way to build software. --Richard Dragan
Topics covered: Extreme Programming (XP) software methodology, principles, XP team roles, facilities design, testing, refactoring, the XP software lifecycle, and adopting XP.
From the Inside Flap
This is a book about Extreme Programming (XP). XP is a lightweight methodology for small-to-medium-sized teams developing software in the face of vague or rapidly changing requirements. This book is intended to help you decide if XP is for you.
To some folks, XP seems like just good common sense. So why the iextremei in the name? XP takes commonsense principles and practices to extreme levels.
If code reviews are good, weill review code all the time (pair programming). If testing is good, everybody will test all the time (unit testing), even the customers (functional testing). If design is good, weill make it part of everybodyis daily business (refactoring). If simplicity is good, weill always leave the system with the simplest design that supports its current functionality (the simplest thing that could possibly work). If architecture is important, everybody will work defining and refining the architecture all the time (metaphor). If integration testing is important, then weill integrate and test several times a day (continuous integration). If short iterations are good, weill make the iterations really, really shortoseconds and minutes and hours, not weeks and months and years (the Planning Game).
When I first articulated XP, I had the mental image of knobs on a control board. Each knob was a practice that from experience I knew worked well. I would turn all the knobs up to 10 and see what happened. I was a little surprised to find that the whole package of practices was stable, predictable, and flexible.
XP makes two sets of promises.
G To programmers, XP promises that they will be able to work on things that really matter, every day. They wonit have to face scary situations alone. They will be able to do everything in their power to make their system successful. They will make decisions that they can make best, and they wonit make decisions they they arenit best qualified to make. G To customers and managers, XP promises that they will get the most possible value out of every programming week. Every few weeks they will be able to see concrete progress on goals they care about. They will be able to change the direction of the project in the middle of development without incurring exorbitant costs.
In short, XP promises to reduce project risk, improve responsiveness to business changes, improve productivity throughout the life of a system, and add fun to building software in teamsoall at the same time. Really. Quit laughing. Now youill have to read the rest of the book to see if Iim crazy. This Book
This book talks about the thinking behind XPoits roots, philosophy, stories, myths. It is intended to help you make an informed decision about whether or not to use XP on your project. If you read this book and correctly decide not to use XP for your project, I will have met my goal just as much as if you correctly decide to use it. A second goal of this book is to help those of you already using XP to understand it better.
This isnit a book about precisely how to do Extreme Programming. You wonit read lots of checklists here, or see many examples, or lots of programming stories. For that, you will have to go online, talk to some of the coaches mentioned here, wait for the topical, how-to books to follow, or just make up your own version.
The next stage of acceptance of XP is now in the hands of a group of people (you may be one) who are dissatisfied with software development as it is currently practiced. You want a better way to develop software, you want better relationships with your customers, you want happier, more stable, more productive programmers. In short, you are looking for big rewards, and you arenit afraid to try new ideas to get them. But if you are going to take a risk, you want to be convinced that you arenit just being stupid.
XP tells you to do things differently. Sometimes XPis advice is absolutely contrary to accepted wisdom. Right now I expect those choosing to use XP to require compelling reasons for doing things differently, but if the reasons are there, to go right ahead. I wrote this book to give you those reasons. What Is XP?
What is XP? XP is a lightweight, efficient, low-risk, flexible, predictable, scientific, and fun way to develop software. It is distinguished from other methodologies by
Its early, concrete, and continuing feedback from short cycles. Its incremental planning approach, which quickly comes up with an overall plan that is expected to evolve through the life of the project. Its ability to flexibly schedule the implementation of functionality, responding to changing business needs. Its reliance on automated tests written by programmers and customers to monitor the progress of development, to allow the system to evolve, and to catch defects early. Its reliance on oral communication, tests, and source code to communicate system structure and intent. Its reliance on an evolutionary design process that lasts as long as the system lasts. Its reliance on the close collaboration of programmers with ordinary skills. Its reliance on practices that work with both the short-term instincts of programmers and the long-term interests of the project.
XP is a discipline of software development. It is a discipline because there are certain things that you have to do to be doing XP. You donit get to choose whether or not you will write testsoif you donit, you arenit extreme: end of discussion.
XP is designed to work with projects that can be built by teams of two to ten programmers, that arenit sharply constrained by the existing computing environment, and where a reasonable job of executing tests can be done in a fraction of a day.
XP frightens or angers some people who encounter it for the first time. However, none of the ideas in XP are new. Most are as old as programming. There is a sense in which XP is conservativeoall its techniques have been proven over decades (for the implementation strategy) or centuries (for the management strategy).
The innovation of XP is
Putting all these practices under one umbrella. Making sure they are practiced as thoroughly as possible. Making sure the practices support each other to the greatest possible degree. Enough
In The Forest People and The Mountain People, anthropologist Colin Turnbull paints contrasting pictures of two societies. In the mountains, resources were scarce and people were always on the brink of starvation. The culture they evolved was horrific. Mothers abandoned babies to roving packs of feral children as soon as they had any chance of survival. Violence, brutality, and betrayal were the order of the day.
In contrast, the forest had plenty of resources. A person had only to spend half an hour a day providing for their basic needs. The forest culture was the mirror image of the mountain culture. Adults shared in raising children, who were nurtured and loved until they were quite ready to care for themselves. If one person accidentally killed another (deliberate crime was unknown), they were exiled, but they only had to go a little ways into the forest, and only for a few months, and even then the other tribespeople brought them gifts of food.
XP is an experiment in answer to the question, iHow would you program if you had enough time?i Now, you canit have extra time, because this is business after all, and we are certainly playing to win. But if you had enough time, you would write tests; you would restructure the system when you learned something; you would talk a lot with fellow programmers and with the customer.
Such a imentality of sufficiencyi is humane, unlike the relentless drudgery of impossible, imposed deadlines that drives so much talent out of the business of programming. The mentality of sufficiency is also good business. It creates its own efficiencies, just as the mentality of scarcity creates its own waste. Outline
The book is written as if you and I were creating a new software development discipline together. We start by examining our basic assumptions about software development. We then create the discipline itself. We conclude by examing the implications of what we have createdohow it can be adopted, when it shouldnit be adopted, and what opportunities it creates for business.
The book is divided into three sections.
The ProblemoThe chapters from iRisk: The Basic Problemi to iBack to Basicsi set up the problem Extreme Programming is trying to solve and present criteria for evaluating the solution. This section will give you an idea of the overall worldview of Extreme Programming. The SolutionoThe chapters from iQuick Overviewi to iTesting Strategyi turn the abstract ideas in the first section into the practices of a concrete methodology. This section will not tell you exactly how you can execute the practices, but rather talks about their general shape. The discussion of each practice relates it to the problems and principles introduced in the first section. Implementing XPoThe chapters from iAdopting XPi to iXP at Worki describe a variety of topics around implementing XPohow to adopt it, what is expected from the various people in an extreme project, how XP looks to the business folks. Acknowledgments
I write in the first person here, not because these are my ideas, but rather because this is my perspective on these ideas. Most of the practices in XP are as old as programming.
Ward Cunningham is my immediate source for much of what you will read here. In many ways I have spent the last fifteen years just trying to explain to other people what he does naturally. Thanks to Ron Jeffries for trying it, then making it much better. Thanks to Martin Fowler for explaining it in a nonthreatening way. Thanks to Erich Gamma for long talks while watching the swans in the Limmat, and for not letting me get away with sloppy thinking. And none of this would have happened if I hadnit watched my dad, Doug Beck, ply his programming craft all those years.
Thanks to the C3 team at Chrysler for following me up the hill, then storming past me on the way to the top. And special thanks to our managers Sue Unger and Ron Savage for the courage to give us the chance to try. Thanks to Daedalos Consulting for supporting the writing of this book. Champion reviewer honors go to Paul Chisolm for his copious, thoughtful, and often downright annoying comments. This book wouldnit be half of what it is without his feedback.
I have really enjoyed my interactions with all my reviewers. Well, at least I have gained tremendous help from them. I canit thank them enough for wading through my 1.0 prose, some of them in a foreign language. Thanks to (listed in the random order in which I read their reviews) Greg Hutchinson, Massimo Arnoldi, Dave Cleal, Sames Schuster, Don Wells, Joshua Kerievsky, Thorsten Dittmar, Moritz Becker, Daniel Gubler, Christoph Henrici, Thomas Zang, Dierk Koenig, Miroslav Novak, Rodney Ryan, Frank Westphal, Paul Trunz, Steve Hayes, Kevin Bradtke, Jeanine De Guzman, Tom Kubit, Falk Bruegmann, Hasko Heinecke, Peter Merel, Rob Mee, Pete McBreen, Thomas Ernst, Guido Haechler, Dieter Holz, Martin Knecht, Dierk K^nig, Dirk Krampe, Patrick Lisser, Elisabeth Maier, Thomas Mancini, Alexio Moreno, Rolf Pfenninger, and Matthias Ressel.
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From the Back Cover
Software development projects can be fun, productive, and even daring. Yet they can consistently deliver value to a business and remain under control.
Extreme Programming (XP) was conceived and developed to address the specific needs of software development conducted by small teams in the face of vague and changing requirements. This new lightweight methodology challenges many conventional tenets, including the long-held assumption that the cost of changing a piece of software necessarily rises dramatically over the course of time. XP recognizes that projects have to work to achieve this reduction in cost and exploit the savings once they have been earned.
Fundamentals of XP include:
- Distinguishing between the decisions to be made by business interests and those to be made by project stakeholders.
- Writing unit tests before programming and keeping all of the tests running at all times.
- Integrating and testing the whole system--several times a day.
- Producing all software in pairs, two programmers at one screen.
- Starting projects with a simple design that constantly evolves to add needed flexibility and remove unneeded complexity.
- Putting a minimal system into production quickly and growing it in whatever directions prove most valuable.
Why is XP so controversial? Some sacred cows don't make the cut in XP:
- Don't force team members to specialize and become analysts, architects, programmers, testers, and integrators--every XP programmer participates in all of these critical activities every day.
- Don't conduct complete up-front analysis and design--an XP project starts with a quick analysis of the entire system, and XP programmers continue to make analysis and design decisions throughout development.
- Develop infrastructure and frameworks as you develop your application, not up-front--delivering business value is the heartbeat that drives XP projects.
- Don't write and maintain implementation documentation--communication in XP projects occurs face-to-face, or through efficient tests and carefully written code.
You may love XP, or you may hate it, but Extreme Programming Explained will force you to take a fresh look at how you develop software.
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Most helpful customer reviews
0 of 1 people found the following review helpful.
One of the most important programming books of the 90s
By Jeffrey C. Roux
I've been following XP for a few months since the first article or interview in C++ Report. Unfortunately, my primary development platform is VB, and I am trying to see how to do XP effectively in VB - we already do many aspects of XP, originally based on experience and the necessities of the business environment rather than any particular methodology or philosophy. I eagerly await the sequel: Playing to Win, because Embracing Change doesn't really give a lot of concrete help on implementation details like how to actually do the automated tests in any environment (Smalltalk has advantages being used in author's environment, but even an implementation in Smalltalk is not detailed). I can't believe anyone gave this one star. This book, along with Alan Coopers' About Face and Inmates, tilt that balance back to goal-oriented software production, acknowledging that we produce software for real needs and real users in the real world. Methodologies' goals aren't always in line with business and user needs. I still give 5 stars for content and ideas, despite failings as a DIY guide for your project. The lack of details should not detract, since implementation will have to be learned in each case, and the importance of the ideas in this book should not be overlooked.
10 of 10 people found the following review helpful.
possibly life-altering
By David Burns
It is difficult to say anything about this book that will not sound like crass exaggeration. Let me restrain myself and say only that it contains a readable description of some ideas that I cannot resist investigating further. For a taste of what's in store, use a search engine to find references to "extreme programming."
On the down side, you will definitely have to investigate further. The book is a bit light and brief, a manifesto for a new approach to development. The author is loosely collaborating with a group that plans to publish several books to fill this gap, among them the already published and quite excellent "Refactoring" by Martin Fowler. Beck and some co-authors are at work on a follow-up called "Playing to Win."
22 of 28 people found the following review helpful.
XP = the Psuedo Revolution
By R. Williams
The claim, in one of the reviews here, that this book is going to rank w/the Gang of 4 book is patently absurd. This book attempts through a kind of Jonathan Edwards Fire and Brimstone approach to convince the reader to get its religion, but when you sum it all up, there isn't much religion to get. All the pillars of the methodology have little or no exposition in the book (unit testing, pair programming, constant builds). They are all mentioned and meekly argued for, but none of them are actually examined. Furthermore, I remember quite distinctly reading about pair programming in Larry Constantine's far better Peopleware a LONG TIME AGO!
Let me add one other crucial point here: this book attempts to achieve acceptance with the reader through creating an impression of both an epiphany and validation. I found that a lot of things that were being espoused here are things I've been doing a long time. I believe many people will find that to be true and consequently will like the book because of the sense of validation it gives. However, when I was done, I couldn't help but think about how much more could have been done here! How about talking about actual unit testing examples? Why not talk about structure within groups; it's far too easy to just say everyone should be doing everything. Profiling, for instance, is clearly not something everyone should be doing. Like so many things in the modern world, this is largely a retread wrapping itself in the cloak of a revolution.
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