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“Understanding the Different Types of the Software Development Methodologies”

A software development methodology or system development methodology in software engineering is a framework that is used to structure, plan, and control the process of developing an information system. The world of software development is something that is limitless. Technology is a perfect blend of innovation and ideation that conceptualizes to form a platform, which is suitable for operating various software developments taking place.
In fact, the methodology meant for software development is considered as a structure used for planning and controlling the procedure of creating a specialized information system.

There are the following methodologies:

Waterfall Model:
If you are into software development at some point or the other, you would have bumped into the Waterfall Model.
Considered as the traditional method of explaining the software development process in software engineering, waterfall model happens to clarify the process into a linear flow with a specified sequence to let the users understand that further level is made progressive on completion of the previous one.
Moreover, this methodology also talks about the fact that going back to deal with the changes is not possible.
Pros:
1. Easy to understand and functional
2. Simple enough to handle as model is rigid
3. Saves significant amount of time
4. Allows for easy testing and analysis
Cons:
1. Only matches precise needs
2. Not applicable for maintenance projects
3. No option to know possible outcome of a project
4. Not excellent for long and ongoing projects

Rational Unified Process (RUP) Methodology
The Rational Unified Process attempts to capture many of modern software development’s best practices in a form suitable for a wide range of projects and organizations. This process recognizes that the traditional waterfall approach can be inefficient because it idles key team members for extended periods of time. Many feel that the waterfall approach also introduces a lot of risk because it defers testing and integration until the end of the project lifecycle. Problems found at this stage are very expense to fix.

1. By contrast, RUP represents an iterative approach that is superior for a number of reasons:
2. It lets you take into account changing requirements which despite the best efforts of all project managers are still a reality on just about every project.
3. Integration is not one “big bang” at the end; instead, elements are integrated progressively.
4. Risks are usually discovered or addressed during integration. With the iterative approach, you can mitigate risks earlier.
5. Iterative development provides management with a means of making tactical changes to the product. It allows you to release a product early with reduced functionality to counter a move by a competitor, or to adopt another vendor for a given technology.
6. Iteration facilitates reuse; it is easier to identify common parts as they are partially designed or implemented than to recognize them during planning.
7. When you can correct errors over several iterations, the result is a more robust architecture. Performance bottlenecks are discovered at a time when they can still be addressed, instead of creating panic on the eve of delivery.
8. Developers can learn along the way, and their various abilities and specialties are more fully employed during the entire lifecycle. Testers start testing early, technical writers begin writing early, and so on.
9. The development process itself can be improved and refined along the way. The assessment at the end of iteration not only looks at the status of the project from a product or schedule perspective, but also analyzes what should be changed in the organization and in the process to make it perform better in the next iteration.

Spiral Model:
Being a highly sophisticated design, it is meant to reduce the early risks in the project.
As per the process going by, the developers initiate on a smaller level and explore the included risks in it.
Further to this, the developers are intended towards crafting a plan for iterating of the spiral.
The accomplishment of any Spiral Lifecycle model is based on consistent, observant, and conversant management of the project.

Pros:
1. Risk factors are considerably reduced
2. Excellent for large and complex projects
3. Allows for additional functionality later
4. Suitable for highly risky projects with varied business needs
Cons:
1. Costly model in software development
2. Failure in risk analysis phase may damage the whole project
3. Not appropriate for low-risk projects
4. Might get continued and never finish
Agile Software Development Methodology:
As an innovative approach, the agile software development methodology is used for articulating a well-organized project management procedure allowing for recurrent alterations.
Certainly, such type of a methodology is one theoretical outline for undertaking several software engineering projects.
Another good thing about it is that it minimizes peril by creating software in short time boxes, known as iterations, which happen to last from one week to one month.
Pros:
1. Adaptive approach that responds to changes favorably
2. Allows for direct communication to maintain transparency
3. Improved quality by finding and fixing defects quickly and identifying expectation mismatches early.
Cons:
1. Focuses on working with software and lacks documentation efficiency
2. Chances of getting off-track as outcome are not clear

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