Extreme ProgrammingA discipline of software development that follows a specific structure that is designed to simplify and expedite the process of developing new software. Kent Beck developed Extreme Programming to be used with small teams of developers who need to develop software quickly in an environment of rapidly-changing requirements.
XP teams design software for specific functionalities without adding any functionalities that are not specifically requested that may slow down the process, keeping the development course simple through systematic and regular testing and design improvements.
Extreme Programming is based on 12 principles:
- The Planning Process -- The desired features of the software, which are communicated by the customer, are combined with cost estimates provided by the programmers to determine what the most important factors of the software are. This stage is sometimes called the Planning Game.
- Small Releases -- The software is developed in small stages that are updated frequently, typically every two weeks.
- Metaphor -- All members on an XP team use common names and descriptions to guide development and communicate on common terms.
- Simple Design -- The software should include only the code that is necessary to achieve the desired results communicated by the customer at each stage in the process. The emphasis is not on building for future versions of the product.
- Testing -- Testing is done consistently throughout the process. Programmers design the tests first and then write the software to fulfill the requirements of the test. The customer also provides acceptance tests at each stage to ensure the desired results are achieved.
- Refactoring -- XP programmers improve the design of the software through every stage of development instead of waiting until the end of the development and going back to correct flaws.
- Pair Programming -- All code is written by a pair of programmers working at the same machine.
- Collective Ownership -- Every line of code belongs to every programmer working on the project, so there are no issues of proprietary authorship to slow the project down. Code is changed when it needs to be changed without delay.
- Continuous Integration -- The XP team integrates and builds the software system multiple times per day to keep all the programmers at the same stage of the development process at once.
- 40-Hour Week -- The XP team does not work excessive overtime to ensure that the team remains well-rested, alert and effective.
- On-Site Customer -- The XP project is directed by the customer who is available all the time to answer questions, set priorities and determine requirements of the project.
- Coding Standard -- The programmers all write code in the same way. This allows them to work in pairs and to share ownership of the code.
Often abbreviated as XP, Extreme Programming should not be confused with Windows XP.
- Watch Datamation's editor James Maguire moderate roundtable discussions with tech experts from companies such as Accenture, Dell, Blue Jeans Network, Microsoft and more »
Tape clearly is on the decline. But remember, legacy systems can hang for a shockingly long time. Read More »Apple Pay Promises to Strengthen Payment Security
Experts believe that Apple Pay and other competitive payment systems will be far more secure than cards, even cards equipped with EMV chips. Read More »Internet of Things Shaping IT's Future
To make the IoT both work and pay off, IT is juggling upgrading and building app-centric networks, mapping out new data center architectures and... Read More »
The trend for the past two years has been for shoppers to spend more online during the holiday season. How do you typically shop for holiday... Read More »How to Create a Desktop Shortcut to a Website
This Webopedia guide will show you how to create a desktop shortcut to a website using Firefox, Chrome or Internet Explorer (IE). Read More »Flash Data Storage Vendor Trends
Although it is almost impossible to keep up with the pace of ongoing product releases, here are three recent highlights in the flash data storage... Read More »