Genislab TechnologiesAgile development model is also a type of Incremental model. Software is developed in incremental, rapid cycles. This results in small incremental releases with each release building on previous functionality. Each release is thoroughly tested to ensure software quality is maintained. It is used for time critical applications. Extreme Programming (XP) is currently one of the most well known agile development life cycle model. Agile methodology is explained in more detail under the Agile Tester topics.
Diagram of Agile model:
Advantages of Agile model:
- Customer satisfaction by rapid, continuous delivery of useful software.
- People and interactions are emphasized rather than process and tools. Customers, developers and testers constantly interact with each other.
- Working software is delivered frequently (weeks rather than months).
- Face-to-face conversation is the best form of communication.
- Close, daily cooperation between business people and developers.
- Continuous attention to technical excellence and good design.
- Regular adaptation to changing circumstances.
- Even late changes in requirements are welcomed
Disadvantages of Agile model:
- In case of some software deliverables, especially the large ones, it is difficult to assess the effort required at the beginning of the software development life cycle.
- There is lack of emphasis on necessary designing and documentation.
- The project can easily get taken off track if the customer representative is not clear what final outcome that they want.
- Only senior programmers are capable of taking the kind of decisions required during the development process. Hence it has no place for newbie programmers, unless combined with experienced resources.
When to use Agile model:
- When new changes are needed to be implemented. The freedom agile gives to change is very important. New changes can be implemented at very little cost because of the frequency of new increments that are produced.
- To implement a new feature the developers need to lose only the work of a few days, or even only hours, to roll back and implement it.
- Unlike the waterfall model in agile model very limited planning is required to get started with the project. Agile assumes that the end users’ needs are ever changing in a dynamic business and IT world. Changes can be discussed and features can be newly effected or removed based on feedback. This effectively gives the customer the finished system they want or need.
- Both system developers and stakeholders alike, find they also get more freedom of time and options than if the software was developed in a more rigid sequential way. Having options gives them the ability to leave important decisions until more or better data or even entire hosting programs are available; meaning the project can continue to move forward without fear of reaching a sudden standstill.
You can refer to our introduction to Agile Methodology if you would like to understand Agile better however, the above information is sufficient for the ISTQB Foundation Level exam.
Other models you may want to study:
Other popular articles:
- What are the Software Development Models?
- What is Incremental model- advantages, disadvantages and when to use it?
- What are the Software Development Life Cycle (SDLC) phases?
- What is V-model- advantages, disadvantages and when to use it?
- What is RAD model- advantages, disadvantages and when to use it?
Rohit savale says
What is meant by RTM and how to prepare RTM?
Oladeji says
I’m a newbie and I would like to learn more from you, I would appreciate it if you can share anything that could be useful with me. Thanks
Lynnox says
can someone use spiral model in longtime projects
Huzefa Bin Nasir says
Where is scrum model? can you please add scrum model?
Jim says
“Even late changes in requirements are welcomed” – Not in my world – the development model aside, significant requirement changes can disrupt development and cause code to be thrown out, which equals sunk-money. We also found that the frequent delivery model was disruptive, especially on the UI side since the user never knew when the UI would change can cause a learning curve.
We also repeatedly find that carving work out into two-week (or any number) of sprints is less than optimal and we frequently had free time at the end of a sprint because there was not enough in the story for a full two weeks – 10 day sprints with stories that take 7 days. Also, running into a development snag (happens a lot in the real world) can delay a story till the next sprint and delay the deployment of the other stories that rely on the delayed story. Now that part of the system is late and out of sync with the rest, but development continues and the developer who know only how to merge into master now have to contend with branches and don’t really understand that process.
The uses of Agile I’ve seen do not increase interactions between developers and business people, in fact, we never knew who the business people were.
All Agile really does is provide more metrics for the development manager to cite in reports.
Hafiz Suleman says
Is agile model is used for point of sale system ?
Corpely says
Agile Developments also fails at times due to Unrealistic Expectations Agile actually is and what it can help you achieve. Agile is commonly believed to be a set a practices, processes and tools, when in fact, Agile is really more of a mind-set and culture.
Rakesh Lakshmikanth says
awesome and simple words helps a lot in understanding the process.
Marzieh Farahani says
I need to reference this.
please write author and date for your tutorials.
Thanks
Proggio says
Very Thank full for sharing your knowledge.
Benjamin DUWAY says
Add a little bit about scrum,,,,,
Benjamin DUWAY says
Yaaah it’s very helpful,,,,, keep it up,,,,,,
Karan says
Add some info about SCRUM.
Hauwa says
What year were this documents posted, i am required to cite them but i need the year for that.
Deron Kosloski says
No you don’t need a year, if there is no year listed, it is indicated s n.d. in APA Format
Liaqat Ali says
good source of knowledge.
Ruchi says
Thanks for writing and sharing this much of knowledge.
vanishree D A says
thank you for sending me ISTQB pdf notes
sardar says
thanks for sending me the pdf of thats