tagged by: extreme programming

Is Design Dead?

For many that come briefly into contact with Extreme Programming, it seems that XP calls for the death of software design. Not just is much design activity ridiculed as "Big Up Front Design", but such design techniques as the UML, flexible frameworks, and even patterns are de-emphasized or downright ignored. In fact XP involves a lot of design, but does it in a different way than established software processes. XP has rejuvenated the notion of evolutionary design with practices that allow evolution to become a viable design strategy. It also provides new challenges and skills as designers need to learn how to do a simple design, how to use refactoring to keep a design clean, and how to use patterns in an evolutionary style.

Continuous Integration

Continuous Integration is a software development practice where members of a team integrate their work frequently, usually each person integrates at least daily - leading to multiple integrations per day. Each integration is verified by an automated build (including test) to detect integration errors as quickly as possible. Many teams find that this approach leads to significantly reduced integration problems and allows a team to develop cohesive software more rapidly. This article is a quick overview of Continuous Integration summarizing the technique and its current usage.

by Martin Fowler

1 May 2006

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popular agile continuous delivery extreme programming

Refactoring Guide

Refactoring is a disciplined technique for restructuring an existing body of code, altering its internal structure without changing its external behavior. Its heart is a series of small behavior preserving transformations. Each transformation (called a "refactoring") does little, but a sequence of these transformations can produce a significant restructuring. Since each refactoring is small, it's less likely to go wrong. The system is kept fully working after each refactoring, reducing the chances that a system can get seriously broken during the restructuring.

The XP 2000 Conference

In late June over a hundred people gathered on the Mediterranean island of Sardinia to take part in the XP2000 conference to discuss Extreme Programming (XP) and other flexible methodologies.

with Jack Bolles

Jul 2000

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extreme programming conferences computer history

The XP 2002 Conference

At the end of May 2002, the XP community once again descended on the Mediterranean island of Sardinia. In this article I look at the plenary speeches from Ken Schwaber, David Parnas, Enrico Zaninotto, Bill Wake, and the Standish Group's Jim Johnson. They lead me into some thoughts on the essence of agile development, the role of mathematical specifications, the complexity of irreversibility, metaphor, and the best way to drastically cut software costs.

by Martin Fowler

2 Jul 2002

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extreme programming conferences

Variations on a Theme of XP

One of the attractive things about XP is that it gives quite definite statements about what you should do to be doing XP. Furthermore that set of practices is carefully designed to fit together. Taking anything out has serious consequences. Yet one of the principles of XP and other agile methods is that they be self adaptive: that is you should change the process as you are developing the project. How does this notion fit in with the rigid practices of XP?

by Martin Fowler

Jan 2001

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extreme programming

Interviewed by Jim Highsmith

When I went to Snowbird in 2001 for the meeting that led to the Manifesto, Jim interviewed me for a book he was working on. It provides a snapshot on my thinking on extreme programming and this thing that a few days later we called agile software development.

by Martin Fowler

Feb 2001

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agile interviews extreme programming

Interview with Kent Beck and Martin Fowler on Extreme Programming

An interview done with Pearson to promote our book Planning Extreme Programming. We banter about the background to XP and the role planning plays in an XP project.

by Martin Fowler

23 May 2001

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extreme programming

Beck Design Rules

Kent Beck came up with his four rules of simple design while he was developing ExtremeProgramming in the late 1990's. I express them like this.

C3

C3 was the short name of the Chrysler Comprehensive Compensation project, a payroll project at Chrysler which has since become famous as the 'birth project' of Extreme Programming.

Code Ownership

There are various schemes of Code Ownership that I've come across. I put them into three broad categories:

Conversational Stories

Here's a common misconception about agile methods. It centers on the way user stories are created and flow through the development activity. The misconception is that the product owner (or business analysts) creates user stories and then put them in front of developers to implement. The notion is that this is a flow from product owner to development, with the product owner responsible for determining what needs to be done and the developers how to do it.

Craftmanship And The Crevasse

Daniel Terhorst-North's recent blog post on software craftsmanship has unleashed a lot of blog discussions (which I summarize below, if you're interested). There's a lot in there, but one of his themes particularly resonated with me, hence this post.

by Martin Fowler

19 Jan 2011

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agile extreme programming process theory

Extreme Programming

Extreme Programming (XP) is a software development methodology developed primarily by Kent Beck. XP was one of the first agile methods, indeed XP was the dominant agile method in the late 90s and early 00s before Scrum became dominant as the noughties passed. Many people (including myself) consider XP to be the primary catalyst that got attention to agile methods, and superior to Scrum as a base for starting out in agile development.

by Martin Fowler

11 Jul 2013

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agile agile adoption extreme programming

Onsite Customer

On-site customer is one of the practices of extreme programming, one of the twelve mentioned in the White Book. It says that a customer should sit with the developers in their open work area to be available to answer questions and interact with the development team. Indeed they are part of the development team, and recognize that the success of the team depends as much on them as it does on the developers. They don't have to give up their reqular job to do this, but they must be physically present.

Pair Programming Misconceptions

A bunch of common misconceptions about pair-programming.

Principles of XP

Every XP aficionado knows about the 4 values and 12 practices, but how many people know about the 15 principles? I'll confess I didn't when Kent talked about them at JAOO last week. After the talk I asked Kent about them: "were they in the White Book". "Yes", he replied, "cunningly hidden in a chapter called 'Basic Principles'".

by Martin Fowler

4 Oct 2003

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extreme programming

Self Testing Code

Self-Testing Code is the name I used in Refactoring to refer to the practice of writing comprehensive automated tests in conjunction with the functional software. When done well this allows you to invoke a single command that executes the tests - and you are confident that these tests will illuminate any bugs hiding in your code.

Unit Test

Unit testing is often talked about in software development, and is a term that I've been familiar with during my whole time writing programs. Like most software development terminology, however, it's very ill-defined, and I see confusion can often occur when people think that it's more tightly defined than it actually is.

by Martin Fowler

5 May 2014

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test categories extreme programming

Very Low Defect Project

When people talk about Extreme Programming, they often focus on such things as its adaptive planning style, or its evolutionary approach design. One small but growing trend that particularly interests me is the small but growing number of XP projects that have very low defect rates, by which I mean less than one production bug per month.

by Martin Fowler

24 Jan 2004

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continuous delivery extreme programming

Xp Velocity

Velocity is a notion that helps calibrate a plan by tying broad statements of effort into elapsed time. Velocity is a statement of how much stuff a team (or a person if it's personal velocity) gets done in a time period. You should usually determine velocity by measuring how much got done in past periods, following the principle of YesterdaysWeather. A typical approach is to average the velocity the past three time periods to determine velocity for future time periods. Velocity was originally formed as part ExtremeProgramming but has since spread and is now used widely in agile software development of all flavors.

by Martin Fowler

17 May 2013

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extreme programming project planning estimation

Yesterdays Weather

This is the principle that says you'll get as much done today as you got done yesterday. In iterative projects it says that you should plan to do as much this iteration as you did last iteration. The term comes from the Extreme Programming community.

by Martin Fowler

12 May 2004

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extreme programming project planning estimation


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