This model consists of the same phases as the waterfall model, but with fewer restrictions. Generally, the phases occur in the same order as in the waterfall model, but these may be conducted in several cycles. A reusable product is released at the end of the cycle, with each release providing additional functionality.
The various phases of Iterative Model
Requirement and analysis phase
In this phase, requirements are collected from customers and examined by an analyst to see if the requirements will be met. Analysts examine what should or should not be achieved within the budget. After all this, the software team proceeds to the next stage.
In the design phase, the team designs the software with different diagrams such as data flow diagram, activity diagram, class diagram, state transition diagram, etc.
In the implementation phase, coding is done, and it is converted to complete software.
After completing the coding phase, software testing starts using various testing methods. There are various testing methods, but the most common is white box testing, black-box testing, and gray box testing methods.
After completing all the steps, the software is deployed in its work environment. In this phase, after product deployment, the review phase is carried out to check the behavior and validity of the developed product.
In this phase, after product deployment, the review phase is carried out to check the behavior and validity of the developed product. And if an error is found, the process begins to review again.
In the maintenance phase, there may be some bugs after the deployment of the software in the work environment; some errors or new updates are required. Maintenance includes debugging and new additional options.
Advantages of Iterative Model
- Many features can be developed quickly in the life cycle.
- Results are received quickly and periodically.
- Testing and debugging is easy during short iterations.
- Less expensive to change scope / requirements.
- Suitable for large projects.
Disadvantages of Iterative Model
- Requires more management attention.
- Risk analysis requires highly efficient resources.
- The project completion date has not been confirmed due to changing requirements.