At the starting point of any software project, organizations and teams have to first deal with the question of the agile vs waterfall model. Software projects follow a methodology of apparently defined processes or software development life cycle (SDLC) to ensure the end product is of high quality. An SDLC classifies phases and the structured flow from one phase to another. Generally, there are six to seven phases. Waterfall and Agile are two famous, but very different, development processes.
The waterfall model is also common as Liner Sequential Life Cycle Model. The waterfall model is followed in sequential order, and so the project development team only moves to the next phase of development or testing if the previous step is completed successfully.
It is one of the easiest and most traditional models to manage. Because of its traditional development humor, each phase has specific deliverables and a review process. The waterfall model works well in smaller-size projects where requirements are simply understandable.
The waterfall model is a universally acknowledged SDLC model. In this method, the whole process of software development is divided into different phases. The development in the waterfall model is seen as flowing regularly downwards (like a waterfall) as it is a continuous software development model. This model is named the “Waterfall Model” because its diagrammatic representation simulates a cascade of waterfalls.
A few important points related to the waterfall model are listed as follows:
The Agile methodology builds up the continuous interaction of the development and testing during the SDLC process of any project. Dissimilar to the waterfall model, the testing and development activities in the agile model are simultaneous. Agile methodology grants much communication between the customers, developers, testers, and managers.
Agile methodology is a type of incremental way to software development based on principles that focuses more on people, results, collaboration, and flexible responses to change. Instead of planning for the full project, it breaks down the development process into small increments completed in iterations or short time frames. Each iteration adds all SDLC phases such that a working product is delivered at the end. After several iterations, a new or updated product is released.
Agile development methodology and testing practices have worked wonders for several organizations with positive forms. The positive forms of agile are not hidden. They are very much clear in organizations.
A few important points related to the agile model are listed as follows:
Below is a difference between Agile and Waterfall models:
|Definition||The waterfall model pursues a sequential design process.||The agile model pursues the incremental approach, where each incremental part is developed through iteration after every timebox.|
|Progress||In the waterfall model, typically the measurement of success is in terms of completed and reviewed artifacts.||In the agile model, generally, the measurement of progress is in terms of developed and delivered functionalities.|
|Nature||On the other hand, the waterfall model is rigid as it does not allow the reshaping of the requirements once the development process starts.||The agile model is flexible as there is a possibility of modifying the requirements even after starting the development process.|
|Customer interaction||In a waterfall model, there is very less customer interaction. It is because the product is delivered to the customer after overall development.||In the agile model, customer interaction is high. It is because, after every iteration, an incremental version/form is deployed to the customer.|
|Team size||In the waterfall model, the team may consist of more or extra members.||It has a smaller team size. A few people work on it so that they can move faster.|
|Suitability||The waterfall model works well in smaller-size projects where requirements are simply understandable. But waterfall model is not good enough for developing large projects.||The agile model is not a good enough model for small projects. The budget for developing small projects using agile is more than compared to other models.|
|Test plan||The test plan is reviewed after complete development.||The test plan is reviewed after every sprint.|
|Testing||It is difficult for the testing team to begin any change in needs.||The testing team can take part in the requirements-changing phase without problems.|