Sashimi software model

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Boehm's spiral model example uses prototyping as the model for each cycle, and portions of a waterfall model for the delivered system stage of the prototyping model. Sometimes It is referred as linear-sequential life cycle model because all phases involve in this model completed one by one in linear fashion. April 5, SDLC. The Scrum model suggests that projects progress via a series of sprints.

In keeping with an agile methodology, sprints are timeboxed to no more than a month long, most commonly two weeks. The Scrum model sees daily scrums as a way to synchronize the work of team members as they discuss the work of the sprint. In short, there is no overlapping in the Waterfall model. In waterfall, development of one phase starts only when the previous phase is complete.

Because of this nature, each phase of the waterfall model is quite precise well defined. The iterative model is a particular implementation of a software development life cycle SDLC that focuses on an initial, simplified implementation, which then progressively gains more complexity and a broader feature set until the final system is complete.

Adaptive maintenance is the modification of software to keep it usable after a change to its operating environment. Adaptive changes primarily affect the software's ability to run on a particular platform, which includes the operating system OS , hardware and network.

The iterative waterfall model provides feedback paths from every phase to its preceding phases, which is the main difference from the classical waterfall model. The feedback paths allow the phase to be reworked in which errors are committed and these changes are reflected in the later phases. The onus on the developer then, is to get the build to normal as soon as possible. But Scrum predicts the entire team to own quality, and all three scrum roles must cooperate to deliver excellence.

In other words, this model is well suited for predictive and repeatable business-as-usual projects. On the other hands, the waterfall model has major drawbacks that can jeopardize some projects:. In contrast with Agile , the waterfall model is more process-centric rather than customer-centric. The late detection of design defects and requirements misunderstanding issues, during the testing phase, is one major drawback of the Waterfall model.

We need to detect the defects earlier in the process. This can be done by emphasizing the validation tests earlier, which requires more upfront work.

In this case the tests and their acceptance criteria must be defined during the requirements specification phase and the design phase. This results in the following V-shape process:. By anticipating the testing phase, the upfront work requirements and design become more robust, and we are more confident to hit the development target.

However, beside this feature, the V-model has the same cons of the Waterfall model: no flexibility nor customer feedback in the course of the process.

Thus, it remains more suited for predictive and repeatable projects. The Waterfall and V models are not adaptive models: they consist of a sequential process, and every phase relies on the previous one. This makes them ill-suited for projects where the schedule needs to be shortened. Furthermore, they might results in poor resource utilization: for instance, during the design phase the implementation team and testing team will be waiting and are not be able to work on the project.

In order to shorten the development time, and involve the teams with different skills in the development without waiting, the Sashimi model was introduced: it is based on the Waterfall model, but a phase can start before the previous phase ends as shown on the figure. The drawback of this process it that it may result in rework, and waste of time.

Another variation of the waterfall model is the incremental model. This may allow overlap between increments parallel work flow to improve resource utilization. Some project are based on previous projects already done Kaizen or next generation , in this case most of the upfront work and design are already defined. Implementation can be done in an incremental way in order to accelerate the development and deliver value earlier.

Using the incremental model, the organization may profit from early value delivery, and get feedback and make necessary changes between increments if possible.

The weakness of this model is that it may results in rework and cost more. Note that since the incremental model allows for some adaptivity in the process, it is used on Agile development practices. The V, Sashimi and Incremental models can be considered as evolved versions of the Waterfall model. They work best for predictable projects, with skilled and experienced teams.

The following two models Unified Process and Spiral are more suited for high-risk projects. If you are dealing in a bigger and riskier project, where the requirements are not all known early, the chances of success are lower. In this case you may consider the unified process UP : a framework that can incorporate other methods and models.

Using iterative and incremental development, the UP is focused on the risk mitigation, which increases chances of success.