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Extreme Programming Explained: Embrace Change US ed Edition

3.9 out of 5 stars 111 customer reviews
ISBN-13: 978-0201616415
ISBN-10: 0201616416
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Editorial Reviews

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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Product Details

  • Paperback: 224 pages
  • Publisher: Addison-Wesley Professional; US ed edition (October 5, 1999)
  • Language: English
  • ISBN-10: 0201616416
  • ISBN-13: 978-0201616415
  • Product Dimensions: 7.3 x 0.4 x 9.3 inches
  • Shipping Weight: 12.8 ounces
  • Average Customer Review: 3.9 out of 5 stars  See all reviews (111 customer reviews)
  • Amazon Best Sellers Rank: #769,330 in Books (See Top 100 in Books)

Customer Reviews

Top Customer Reviews

Format: Paperback
A few years ago, Nathaniel Borenstein wrote a fine little book called "Programming as if People Mattered", which is mostly about user interface design. It's almost a shame that the title has been used, because it's also an apt description of Kent Beck's new book. This is a development methodology that acknowledges that developers matter, and that customers matter, too. And they matter in both good and bad ways: Extreme Programming acknowledges that people have rights and strengths, but also that they have weaknesses, and it works with those weaknesses rather than against them. This is a welcome contrast to most of the mainstream software methodologies, where only the methodology seems to matter.
Beck and the other Extreme Programming advocates have been in "evangelism mode" of late, and their zeal has occasionally seemed excessive. This book, though, is well-reasoned and balanced. The limitations of XP are freely acknowledged, and Beck argues that in some cases and situations, XP is probably not appropriate. His goal, as the title states, is to explain XP, to help readers understand it so that they can decide whether it's for them. I think he succeeds completely.
For such important material, the book is light and easy to read. It's also short and direct. Spend a day or two reading this book, and then spend a week or two thinking about its recommendations in light of your current project. You owe it to all of the people associated with your project who matter.
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Format: Paperback
This book will challenge your preconceptions about how software should be developed. It is a direct challenge to the old way of software development where we talked about "Freezing Requirements". It asks us to use the power of Object technology to Embrace Change instead.
Extreme Programming is a methodology that allows developers and customers to work together in a synergistic manner. It takes the idea of Incremental and Iterative development and shows how to effectively apply it in the real world to produce business value.
This book explains how small teams of developers can work together using a set of self reinforcing practices that enable great productivity and quality.
It is about time that a developer has written a book that questions the high ceremony, document centric software development methodologies. What we need is a balance between developer friendly practices such as testing your ideas out using code (often derided as "hacking"), and the need a business has of knowing that their investment in the software will pay off. Not all problem domains will benefit from eXtreme Programming, but that is true of any methodology (and at least eXtreme Programming is up front about the need to check if the process is applicable).
To those critics that accuse this book of promoting hacking and ignoring all we have learnt about how to develop software, I suggest that it is time to apply scientific thinking. Try some experiments with your current process, then try some eXtreme Programming experiments and see which give the best results.
In summary, a Great Book, Buy it, Read it, Think about applying the lessons of eXtreme Programming.
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This approach to programming was much bandied about and a little controversial at a software engineering conference I recently attended. Beck's premise is to take proven good practices in software development and max them out:
- if code reviews are good, do code reviews constantly by having another programmer look over your shoulder.
- if testing is good, write your test plans first and then test each time you implement another feature
- if integration is good, integrate almost constantly so that the system always works
The underlying premise is that the old, familiar cost curve that says it costs a thousand times as much to fix a mistake in the testing phase as in the requirements phase is no longer accurate: we have much better tools now than when that curve was formulated, we're living in Internet time, and the customers don't know what the heck they want anyway. So we might as well go ahead and try to give them something, then fix it up later, rather than trying to divine their goals now.
The problem I see with this is that there's not much time allowed for doing analysis and design. Beck specifically counsels against trying to anticipate capabilities, but if you know what you're doing, anticipating capabilities can save you a lot of time down the line. (His rejoinder is that it can also cost you a lot of time in implementing and debugging features that don't work and may never be used.) No matter how clever you may be, doing design as you code seems to me to be one cut above the worst sort of hacking.
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I believe that XP is one of the most important breakthroughs in quality-focused development in the past decade. It is a language-independent approach that embodies what is best in software engineering, project planning and control, and attention to quality.
This book is a fast overview of XP and should be required reading for any development manager who wants to get control of cost, schedule and quality. Despite its small page count, it covers all of the key points and will demonstrate to those who are put off by the name, "Extreme Programming", that this is a viable approach.
As I read through this book I saw a lot of parallels in the author's description of XP to some of the best practices and key process areas of the capability maturity model. I was especially surprised at how close XP is to Watts Humphrey's personal and team software processes. These similarities show that XP is a serious software engineering approach and a good fit into companies that have invested in improving their capabilities through attainment of the higher CMM levels, software engineering process groups, etc. Indeed, the metrics that are collected and used by XP practitioners will feed valuable data into an SQA group for transformation into meaningful data for process and quality improvement.
Don't let the title "Extreme Programming" or the short page count of this book deter you from taking it seriously. Mr. Beck clearly describes XP and amply proves its value in this brief survey. If you want to see just how serious XP as a software engineering and project management discipline, read this book, then get a copy of Watts Humphrey's A Discipline for Software Engineering. I give this book 5 stars and my highest recommendation.
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