Extreme Programming Explained: Embrace Change

1 Praise for Extreme Programming explained , Second Edition In this second edition of Extreme Programming explained ,Kent Beck orga-nizes and presents five years worth of experiences, growth, and Change revolv-ing around XP. If you are seriously interested in understanding how you andyour team can start down the path of improvement with XP, you must readthis book. Francesco Cirillo, Chief Executive Officer, XPLabs The first edition of this book told us what XP was it changed the way manyof us think about software development. This second edition takes it fartherand gives us a lot more of the why of XP, the motivations and the principlesbehind the practices. This is great stuff. Armed with the what and the why, we can now all set out to confidently work on the how : how to run ourprojects better, and how to get agile techniques adopted in our organizations.

2 Dave Thomas, The Pragmatic Programmers LLC This book is dynamite! It was revolutionary when it first appeared a few yearsago, and this new edition is equally profound. For those who insist on cook-book checklists, there s an excellent chapter on primary practices, but I urgeyou to begin by truly contemplating the meaning of the opening sentence inthe first chapter of Kent Beck s book: XP is about social Change . You shoulddo whatever it takes to ensure that every IT professional and every IT man-ager all the way up to the CIO has a copy of Extreme ProgrammingExplainedon his or her desk. Ed Yourdon, author and consultant XP is a powerful set of concepts for simplifying the process of softwaredesign, development, and testing.

3 It is about minimalism and incrementalism,which are especially useful principles when tackling complex problems thatrequire a balance of creativity and discipline. Michael A. Cusumano,Professor, MIT Sloan School of Management, andauthor of The Business of Software Extreme Programming Explainedis the work of a talented and passionatecraftsman. Kent Beck has brought together a compelling collection of ideasabout Programming and management that deserves your full attention. Myonly beef is that our profession has gotten to a point where such common-sense ideas are labeled Extreme .. Lou Mazzucchelli, Fellow, Cutter Business Technology Council If your organization is ready for a Change in the way it develops software,there s the slow incremental approach, fixing things one by one, or the fasttrack, jumping feet first into Extreme Programming .

4 Do not be frightened bythe name, it is not that Extreme at all. It is mostly good old recipes and com-mon sense, nicely integrated together, getting rid of all the fat that has accu-mulated over the years. Philippe Kruchten, UBC, Vancouver, British Columbia Sometimes revolutionaries get left behind as the movement they started takeson a life of its own. In this book, Kent Beck shows that he remains ahead ofthe curve, leading XP to its next level. Incorporating five years of feedback, thisbook takes a fresh look at what it takes to develop better software in less timeand for less money. There are no silver bullets here, just a set of practical prin-ciples that, when used wisely, can lead to dramatic improvements in softwaredevelopment productivity.

5 Mary Poppendieck, author of Lean Software Development: An Agile Toolkit Kent Beck has revised his classic book based on five more years of applying andteaching XP. He shows how the path to XP is both easy and hard: It can bestarted with fewer practices, and yet it challenges teams to go farther than ever. William Wake, independent consultant With new insights, wisdom from experience and clearer explanations of theart of Extreme Programming , this edition of Beck s classic will help many real-ize the dream of outstanding software development. Joshua Kerievsky,author, Refactoring to Patterns, and Founder, IndustrialLogic, Inc. XP has changed the way our industry thinks about software development. Itsbrilliant simplicity, focused execution, and insistence on fact-based planningover speculation have set a new standard for software delivery.

6 David Trowbridge, Architect, Microsoft CorporationExtreme ProgrammingExplainedSecond EditionThe XP SeriesKent Beck, Series AdvisorExtreme Programming , familiarly known as XP, is a discipline of the businessof software development that focuses the whole team on common, reachablegoals. Using the values and principles of XP, teams apply appropriate XP prac-tices in their own context. XP practices are chosen for their encouragement ofhuman creativity and their acceptance of human frailty. XP teams producequality software at a sustainable of the goals of XP is to bring accountability and transparency to softwaredevelopment, to run software development like any other business goal is to achieve outstanding results more effective and efficientdevelopment with far fewer defects than is currently expected.

7 Finally, XP aimsto achieve these goals by celebrating and serving the human needs of everyonetouched by software development sponsors, managers, testers, users, XP series exists to explore the myriad variations in applying XP. While XPbegan as a methodology addressing small teams working on internal projects,teams worldwide have used XP for shrink-wrap, embedded, and large-scaleprojects as well. The books in the series describe how XP applies in these andother situations, addressing both technical and social has come to software development. However, Change can be seen asan opportunity, not a threat. With a plan for Change , teams can harness thisopportunity to their benefit. XP is one such plan for in the SeriesExtreme Programming Applied: Playing to Win, Ken Auer and Roy MillerExtreme Programming explained , Second Edition: Embrace Change , Kent Beck with Cynthia AndresExtreme Programming Explored, William C.

8 WakeExtreme Programming for Web Projects, Doug Wallace, Isobel Raggett, and Joel AufgangExtreme Programming Installed, Ron Jeffries, Ann Anderson, and Chet HendricksonPlanning Extreme Programming , Kent Beck and Martin FowlerTesting Extreme Programming ,Lisa Crispin and Tip HouseFor more information, check out the series Web site at ProgrammingExplainedSecond EditionEmbrace ChangeKent Beckwith Cynthia AndresBostonThe author and publisher have taken care in the preparation of this book, but make no expressed orimplied warranty of any kind and assume no responsibility for errors or omissions. No liability isassumed for incidental or consequential damages in connection with or arising out of the use of theinformation or programs contained : John WaitEditor in Chief: Don O Hagan Acquisitions Editor: Paul PetraliaManaging Editor: John FullerProject Editors: Julie Nahil and Kim Arney MulcahyCompositor: Kim Arney MulcahyManufacturing Buyer: Carol MelvilleThe publisher offers excellent discounts on this book when ordered in quantity for bulk purchases orspecial sales, which may include electronic versions and/or custom covers and content particular toyour business, training goals, marketing focus, and branding interests.

9 For more information, pleasecontact:U. S. Corporate and Government Sales(800) sales outside the U. S., please contact:International us on the Web: of Congress Cataloging-in-Publication DataBeck, Programming explained : Embrace Change / Kent Beck with Cynthia Andres. 2nd bibliographical references and 0-321-27865-8 (alk. paper)1. Computer software Development. 2. Extreme Programming . I. dc222004057463 Text copyright 2005 Pearson Education, cover art copyright 2004 by Kent BeckAll rights reserved. Printed in the United States of America. This publication is protected by copyright,and permission must be obtained from the publisher prior to any prohibited reproduction, storage in aretrieval system, or transmission in any form or by any means, electronic, mechanical, photocopying,recording, or likewise.

10 For information regarding permissions, write to:Pearson Education, and Contracts DepartmentOne Lake StreetUpper Saddle River, NJ 07458 Many of the designations used by manufacturers and sellers to distinguish their products are claimed astrademarks. Where those designations appear in this book and we were aware of a trademark claim, thedesignations have been printed in initial caps or all 0-321-27865-8 Text printed in the United States on recycled paper at Courier in Stoughton, printed in the United States on recycled paper at Courier in Westford, printing, January 2012To CindeeWithout you, this book would still be about programmers hiding in acorner. Without you, I would still be one of those page intentionally left blank Note To ProgrammersEven programmers can be whole people in the real world.