Agile SDLC Model:-

Agile SDLC model is a combination of iterative and incremental process models with focus on process adaptability and customer satisfaction by rapid delivery of working software product.

Agile Methods break the product into small incremental builds. These builds are provided in iterations. Each iteration typically lasts from about one to three weeks. Every iteration involves cross functional teams working simultaneously on various areas like planning, requirements analysis, design, coding, unit testing, and acceptance testing.

At the end of the iteration a working product is displayed to the customer and important stakeholders.

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

Iterative approach 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.

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

Agile Process Models:

Extreme Programming (XP)

Adaptive Software Development (ASD)

Dynamic Systems Development Method (DSDM)

Scrum

Crystal

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Feature Driven Development (FDD)

Agile Modeling (AM)

Dynamic Systems Development Method:-

Provides a framework for building and maintaining systems which meet tight time constraints using incremental prototyping in a controlled environment

Uses Pareto principle (80% of project can be delivered in 20% required to deliver the entire project)

Each increment only delivers enough functionality to move to the next increment

Uses time boxes to fix time and resources to determine how much functionality will be delivered in each increment

Guiding principles

Active user involvement

Teams empowered to make decisions

Fitness foe business purpose is criterion for deliverable acceptance

Iterative and incremental develop needed to converge on accurate business solution

All changes made during development are reversible

Requirements are baselined at a high level

Testing integrates throughout life-cycle

Collaborative and cooperative approach between stakeholders

Life cycle activities:-

Feasibility study (establishes requirements and constraints)

Business study (establishes functional and information requirements needed to provide business value)

Functional model iteration (produces set of incremental prototypes to demonstrate functionality to customer)

Design and build iteration (revisits prototypes to ensure they provide business value for end users, may occur

concurrently with functional model iteration)

Implementation (latest iteration placed in operational environment)