SDLC Agile model is comparatively a newer concept for software development and testing. This model is a perfect combination of iterative and incremental process models and it focuses on process adaptability and customer satisfaction.
What is Agile Model
In Agile model each project will be handled with a unique approach and the existing methods will be tailored to suit the project. The tasks will be divided into small time frames or time boxes or deliver a special feature for each release. Each build is incremental in terms of features and after the final build, the application will have all the features required by the customer. There are many different Agile methods and the following are the most popular ones among them.
- Rational Unified Process
- Crystal Clear Extreme Programming
- Adaptive Software Development
- Feature Driven Development
In 2001, Agile Manifesto was published and after that, these methods are collectively called as Agile Methodologies.
Agile Manifesto Principles
- Individuals and Interactions: – Self-organization and motivation are very much important in the Agile method as co-location and pair programming.
- Working software: – Instead of using document, demo working software will help customers to understand the requirements better.
- Customer Collaboration: – Continuous interaction with the customer is very important as all the requirements cannot be collected at the beginning of the project.
- Quick Responds to changes: – Quick response to changes are important in Agile and it focusses on continuous development.
Agile Vs Traditional SDLC Models
Agile method is based on an Adaptive method where there will not be a detailed planning but a clear idea about the future tasks and that are limited to the features to be developed. The development process is feature driven and the team will have to adapt to the changing requirements automatically and dynamically. The product is tested frequently.
At the same time traditional SDLC methods, especially the waterfall method is based on the predictive method of software development where there will be detailed planning and the tasks for quite long time will be fixed. It is wholly depended on the requirement collection and analysis done in the early stages.
Agile Model Pros and Cons
- It is highly realistic model
- Cross training and teamwork is promoted
- Rapid development and demonstration of functionalities
- Minimum resource requirement
- Suitable for both fixed and changing requirements.
- No planning is required
- Highly flexible
- Easy to develop
- Not advisable for complex dependencies.
- An overall agile plan, an agile leader, and an agile project manager are a must.
- Depending more on customer interaction and if the customer is not clear about the requirements it will be a problem.