Sequential sdlc model9/12/2023 The waterfall model can be used for small projects and for projects with clear requirements. Spiral model operates on iterations so it is possible to go back to the previous phases. In waterfall model, after completing a phase and reached a new phase, it is not possible to go back to the previous phase. The customer has an awareness of what the product is. In spiral model, the customer involvement is high. In waterfall model, the customer involvement is minimum. The spiral model is a risk driven process model generator for software projects. The waterfall model is a relatively linear sequential design approach to develop software projects. What is the Difference Between Waterfall and Spiral Model? Those are some drawbacks of the spiral model. Also, it is not a suitable model for small projects. The risk analyzing might require expert employees and the spirals might take a long time. It provides more control towards all phases of development. It is suitable for a project that requires continuous risk analysis. Spiral model is more suitable for large and complex projects. Again the project goes through the above phases. If the customer approved, the project can continue to the next spiral. In the evaluation phase, the output is shown to the customer to get a feedback. In the Engineering phase, software development and testing occur. A prototype is produced at the end of this phase. If there are any risks, alternative solutions are suggested. Risk analyzing phase is to identify the risks associated with the project. The Software Requirement Specification (SRS) is developed using the gathered requirements. Identifying the system and subsystem requirements are done in this phase. Finally, new enhancements and further improvements are added to the product in the maintenance phase. After the testing is completed, the product is released to the market. Each unit is tested and all the units are integrated into a complete system and tested in the integration and testing phase. In the implementation phase, the system is developed in small units. The system design helps to define the overall system architecture. This document is called the Software Requirement Specification (SRS). In this phase, the requirements necessary for the project is collected and analyzed. The first phase is to the requirement gathering and analysis. The outcome of one phase becomes the input for the next phase. In this approach, the whole software development process is divided into phases. There is no overlapping between the phases. One phase starts after the completion of the previous phase. Waterfall model is a software development process model with a linear sequential flow. Side by Side Comparison – Waterfall vs Spiral Model in Tabular Form Waterfall and Spiral Model are two of them. These models are known as software development process models. There are various software development life cycle models which can be followed during the software development process. Software Development Life Cycle (SDLC) is a process followed by a software organization to develop a software project. The key difference between waterfall and iterative model is that waterfall model is used for smaller projects and projects with clear requirements while the spiral model is used for large, complex projects that require continuous risk analyzing. Key Difference – Waterfall vs Spiral Model
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