SDLC - Agile Model

Agile SDLC model is a combination of iterative and incremental process models with focus on procedure adjustability and customer satisfaction past rapid commitment of working software product. Agile Methods break the production into small incremental builds. These builds are provided in iterations. Each iteration typically lasts from virtually one to 3 weeks. Every iteration involves cross functional teams working simultaneously on various areas like −

Planning
Requirements Analysis
Design
Coding
Unit Testing and
Credence Testing.

At the finish of the iteration, a working production is displayed to the customer and of import stakeholders.

What is Agile?

Active model believes that every project needs to be handled differently and the existing methods need to exist tailored to best suit the projection requirements. In Agile, the tasks are divided to time boxes (modest fourth dimension frames) to deliver specific features for a release.

Iterative arroyo is taken and working software build is delivered after each iteration. Each build is incremental in terms of features; the final build holds all the features required by the customer.

Here is a graphical illustration of the Agile Model −

SDLC Agile Model

The Agile thought process had started early on in the software evolution and started becoming popular with time due to its flexibility and adaptability.

The most popular Agile methods include Rational Unified Process (1994), Scrum (1995), Crystal Clear, Extreme Programming (1996), Adaptive Software Evolution, Characteristic Driven Development, and Dynamic Systems Development Method (DSDM) (1995). These are now collectively referred to equally Agile Methodologies, after the Agile Manifesto was published in 2001.

Following are the Agile Manifesto principles −

Individuals and interactions − In Active evolution, self-organization and motivation are important, every bit are interactions similar co-location and pair programming.
Working software − Demo working software is considered the best ways of communication with the customers to understand their requirements, instead of only depending on documentation.
Client collaboration − As the requirements cannot be gathered completely in the beginning of the projection due to various factors, continuous customer interaction is very of import to get proper product requirements.
Responding to alter − Agile Evolution is focused on quick responses to change and continuous development.

Active Vs Traditional SDLC Models

Agile is based on the adaptive software development methods, whereas the traditional SDLC models like the waterfall model is based on a predictive approach. Predictive teams in the traditional SDLC models usually work with detailed planning and accept a complete forecast of the exact tasks and features to exist delivered in the next few months or during the product life bike.

Predictive methods entirely depend on the requirement analysis and planning washed in the kickoff of bike. Whatsoever changes to be incorporated go through a strict change control management and prioritization.

Agile uses an adaptive arroyo where there is no detailed planning and there is clarity on futurity tasks just in respect of what features demand to be developed. There is feature driven evolution and the team adapts to the changing production requirements dynamically. The product is tested very frequently, through the release iterations, minimizing the adventure of whatever major failures in future.

Customer Interaction is the backbone of this Agile methodology, and open up communication with minimum documentation are the typical features of Agile evolution surroundings. The agile teams work in shut collaboration with each other and are nearly frequently located in the same geographical location.

Agile Model - Pros and Cons

Agile methods are being widely accustomed in the software globe recently. However, this method may not always exist suitable for all products. Here are some pros and cons of the Agile model.

The advantages of the Agile Model are as follows −

Is a very realistic approach to software evolution.
Promotes teamwork and cross grooming.
Functionality can be developed rapidly and demonstrated.
Resources requirements are minimum.
Suitable for fixed or changing requirements
Delivers early fractional working solutions.
Proficient model for environments that modify steadily.
Minimal rules, documentation easily employed.
Enables concurrent development and delivery within an overall planned context.
Little or no planning required.
Easy to manage.
Gives flexibility to developers.

The disadvantages of the Agile Model are every bit follows −

Non suitable for handling complex dependencies.
More risk of sustainability, maintainability and extensibility.
An overall plan, an agile leader and agile PM practice is a must without which information technology will non work.
Strict delivery management dictates the scope, functionality to be delivered, and adjustments to run across the deadlines.
Depends heavily on customer interaction, so if customer is not articulate, squad can be driven in the wrong direction.
There is a very loftier individual dependency, since at that place is minimum documentation generated.
Transfer of technology to new team members may be quite challenging due to lack of documentation.