I assume that you are referring to agile processes. Scrum is not the only one but is widely spread and used. In my opinion because it is simple, straightforward, and easy to implement and customize. I highly recommend it.
Other agile processes include eXtreme Programming, Crystal Clear, Agile Unified Process, etc. The main characteristics of all is that they are iterative and incremental, and the time slot for iteration is typically fixed. They enable evolution thinking and navigation through the project and allow teams to better handle change management.
Now back to agile methodology term, which includes processes, but may go beyond that. What I mean is that you can implement one of the agile processes, but also embrace various agile practices which are also part of the methodology. Those include use of user stories and story points, use cases, test-driven development, behavior-driven development, feature-driven development, pair programming, continuous integration, automated testing (unit and feature/acceptance), refactoring, velocity tracking, and others. All of these, and more, can be selected by your team and utilized together with the agile process that best fits your needs.
I hope this helps.
well there are a number of different Agile methodologies that are used in the industry and software development organizations as a whole. Depending on the specific needs, past working experience, familiarity, etc. these are opted. However, Scrum and XP are considered as two of most widely used software development methodologies. However, there are huge organizations that use other methodologies too so it basically depends on the usage criterion as they all include the facility of having iterative development and "Agile Manifesto" is the main thing that governs these methodologies.
I like both Scrum and XP. I now I would infact perfer a mixture of XP and Scrum i.e. add the Testing used in XXP either in the iteration for Scrum or have 2 parallel interations if I have 2 teams to work on both at the same time.
Usually only some pratices from these methodologies are used. Where i'd work we used some pratices from xp and some others from scrum(most used), but to get advantage in using it, these using it should try to use it right, we failed a little about it, so didn't see any advanges to the employee, only for the enterprise cuz the get to make you work more and constantly. If i was a SEO i would be happy in apply these methodologies, but as employee, i don't think i want to work with. (Felt as a slave a little bit kkk)
At SEI we are working with Rally to analyze some of data from projects. We should have an initial report before the end of the year. Larry is doing his PhD on the subject
http://www.youtube.com/playlist?list=PLSRf1YEPZ7uSRlu0FVo3uqRxP-W7KH2lg
Take anything at this point with great caution. It is very hard to tell what people are actually doing and results always have high variation.
Hey, we're conducting some research in this area. One preliminary result is given in a Master's Thesis "Investigation of the Usage of Artifacts in Agile Methods" that you can find here: http://www4.in.tum.de/~kuhrmann/studworks/mg-thesis.pdf
There are some references that refer to surveys, statistics, and so forth.
Another point to start could be the BQI report: http://de.scribd.com/doc/66169786/Agile-Software-Development-Methods-2010-e-Ga-Co
To find a reliable answer to this question, you may have a look at the last survey done by VersionOne recently.
http://stateofagile.versionone.com/
A very good study is provided by Komus, A.: Status Quo Agile
Second study on success and forms of usage of agile methods. It also gives answers why users prefer different agile approaches (efficiency, transparency, quality etc.).
http://www.hs-koblenz.de/en/rmc/fachbereiche/wirtschaft/forschung-projekte/forschungsprojekte/status-quo-agile-en/
Although Scrum is the most used one of agile methodologies, it is not the only. XP and Scrum are two most common agile software methods. While Scrum is focused on project management, XP is focused on Software development; nevertheless, they both can be used to participate in the development of any software project independently or together. Increasing number of surveys is supporting the anecdotal evidence that variations of combination of Scrum with XP are the most popular agile methods. This finding is backed up by the results of surveys conducted by VersionOne that report on the status of organizations currently implementing or practicing agile methods.
This link talk about:
Agile Advantages for Software Development and Your Business
https://devcom.com/tech-blog/agile-advantages-for-business/
This paper may help you to find the answer.
Conference Paper Comparative Study within Scrum, Kanban, XP Focused on Their Practices
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