Waterfall is a structured software development methodology, and often times can be quite rigid, whereas the Agile methodology is known for its flexibility. If you want to use the Waterfall model for software development, then you have to be clear with all the development requirements beforehand as there is no scope of changing the requirements once the project development starts. The Agile methodology, on the other hand, is quite flexible, and allows for changes to be made in the project development requirements even after the initial planning has been completed.
Agile methodologies propose an incremental and iterative approach to software design. In Agile, product is developed in small incremental builds. These builds are also called as sprints. The life time of each sprints is about one to three weeks. In each sprint cross functional teams works simultaneously on various areas like planning, requirements analysis, design, coding and testing. At the end of each iteration a demo product is made available to the customer or stake holder for sign-off.
Scrum, a project management framework that promotes short cycles, iteration, learning, and team improvement, as well as getting and measuring feedback to ship the next increment of a product.
Agile Methodology has following advantages:-
Testing
At the end of sprint, testing is done which make sure that all bugs are caught and fixed. Running product can be launched to end users at the end of each cycle.
Flexibility
Agile allows the freedom to make changes as necessary. After every sprint, the team re-evaluates the direction of the project and adapts accordingly. With other methodologies, project managers are bound to what is in the design document that was approved in the very initial stage of the project. At the end of sprint, client can add their feedback so that they ultimately get the product they desire.
Issue Identification
Issues can be uncover early. Iterative testing and integration is done throughout the entire cycle of the project so the development team is able to address issues with each release and adapt to change, when necessary.
Schedule & Cost
Each sprint has fixed duration and scope. There is a clearer understanding of the cost of the entire project as well as the timeline for its delivery. Client evaluates cost estimation for each sprint and they can take decisions and prioritize features which needs to be done early.
Communication
Timely calls with Client. Client review project progress and give feedback. Those feedback can be implemented so that end user does not have wrong product at the end.
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