Evidence for Pair Programming in .NET

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Evidence for Pair Programming
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Williams (2000) presented some evidence for the bene ts of pair programming. The approach has been criticized on blogs such as hacknot.info, and other experiments by other researchers (Nawrocki, 2001) have produced different conclusions. In practice, pair programming is not for everyone as some people s personalities are such that they seem to be unable to cope with the intense relationships with their partners that are needed. Our experience has been that, in the right context, that is, a real project with a real customer and combined with the other XP practices, pair programming works for most people many of whom become very enthusiastic about it.
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Evidence for XP
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There is again a problem in identifying conclusive and convincing evidence about the bene ts of XP. Carrying out comparative experiments in an industrial setting is always going to be a problem, and much of the evidence is based on simple experiments involving students. Macias (2003) found a small bene t in a comparative study involving small industrial projects. Abdullah (2003) found that the more XP practices used, the better the quality of the software, again in small industrial projects. Abdullah (2006) also found that there was evidence that teams using XP experienced a higher level of well-being than did teams using a design-led approach involved in the same projects. There are many critics of XP, and the book Extreme Programming Refactored: The Case Against XP (Stevens, 2003) takes a number of aspects of XP and criticizes them. Some of the criticism is based more on the exaggerated claims of some who were not adopting the full set of practices; other issues need a more detailed consideration. Part of the rationale of this book is to consider these issues in the light of our experiences over 7 years with hundreds of XP projects, their programmers, and their clients.
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Exercise
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PREPARING TO XP
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The purpose of the rest of this book is to provide you with the insight and the support to make a real agile project, based on the XP principles, an enjoyable and successful experience. Nothing can be guaranteed, of course, but whatever happens, many lessons will be learned, and at the end of it you may be in a much better position to answer the question: Does XP work
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EXERCISE
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This exercise assumes that you are about to start working in a small group of four or ve people on a software development project. It is intended to provide an early experience of some of the XP practices. It is recommended that the exercise is done in a college laboratory or terminal room where it is possible to discuss what you are doing without disturbing other users. Objectives To introduce the idea of pair programming and to carry out a simple pair programming activity, which also relates to the activity of writing unit tests. It also tests out communication within the team and points toward the use of coding standards. Method Form into a pair. Change round on the machine every 20 minutes. Each pair will develop a simple Java program that does the following: takes as input a list of characters representing team members and a number representing work sessions and outputs something equivalent to a 1 1 table with columns indexed by the number of sessions and lists of pairs so that both pairs are present in each session. Example 1 Input: {A, B, C, D, E} (a ve-person team and six sessions). Table E1 Session Pairs 1 {A,B}, {C,D}, {E} 2 {A,C}, {D,E}, {B} 3 {D,E}, {B,C}, {A} 4 {B,C}, {A,E}, {D} 5 {D,E}, {A,B}, {C} 6 {E,A}, {C,D}, {B}
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Output: Thus in the rst session, A and B pair up and C and D pair up and E operates on their own. Example 2 Input: {A, B, C, D} and ve sessions.
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2 Extreme Programming Outlined Table E2 Session Pairs 1 {A,B}, {C,D} 2 {A,C}, {B,D} 3 {D,C}, {A,B} 4 {B,C}, {A,D} 5 {B,D}, {A,C}
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Output: It is not required that the program has to display the results in such a table, just lists will do. The rst task is to write the test cases. This is not particularly easy as there is usually very little emphasis on testing and writing tests in programming courses. Later we will see how to do this in a more systematic way, but for the time being write down simple test sets that provide two things: input values and the corresponding outputs. You need to develop a test environment based on your test cases and JUnit. Log onto www. XProgramming.com and nd the JUnit software for Java. This was written by Kent Beck. Download this into your account and read the accompanying documentation. Change round on the machine every 20 minutes. Prepare some brief notes just suf cient so that you can make sense of how it is used. Now start the coding. Run your tests even if you have not nished coding. Debug as needed. Continue coding and testing. Don t forget to change places every 20 minutes or so. Now read up the Java coding standards (peep ahead to 8 or look at http://www.dcs. shef.ac.uk/$wmlh/Java.pdf). Review the code to see if the coding standards are met. If not, refactor, that is adjust, the code to ensure compliance. Retest the code. Discuss how you nd pair programming. Talk about its good points and those aspects that you found dif cult, annoying, or wasteful. For the other practices, discuss how you might be able to adopt them what are the dif culties; how might they bene t you
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