What is an agile model?
Agile methodology is a squad theory that addresses the full growth of a programming tool while emphasizing product quality. It describes a sprint, which is a time-boxed phase that lasts two weeks. A list of performance metrics is favored at the beginning of each sprint customer feedback. The team and the client assess the jobs at the end of the sprint, writing observations for system development. Agile methodology is defined as a methodology based on broad principles, with more exact techniques based on procedures, such as Scrum and Kanban, being called types of agile methodology.
Why the agile model?
The agile methodology is adopted due to following reasons. They are:
- It focuses on delivering quality products and makes the customers happy.
- Agile processes are more efficient and reliable
- Iit comes with a variety of methods in order to fulfill the needs of the customers.
- It creates the work culture that increases productivity and quality.
- The agile principles help in motivating the team members very easily.
What is a waterfall model?
Waterfall methodology is a continuous demand to SDLC that separates it into separate stages such as requirement analysis, analysis and design, coding and unit testing, system and user acceptance testing, and deployment. The next phase will start only after the prior phase is finished. A project or a document is anticipated to be approved off between those phases. All phases are really only delivered through and finished once, so all specifications are collected as much as feasible at the outset aim of providing information for the creation of plans, schedules, budgets, and resources. Because it is plan-driven, any changes made after the project has begun would invalidate the original plan and necessitate a restart.
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Why the waterfall model?
The waterfall model is preferred due to following reasons. They are:
- The Waterfall methodology, as an internal process, places little emphasis on the end user or client involved in a project.
- Its primary goal has always been to assist internal teams in moving more efficiently through project phases, which can be beneficial in the software world.
Advantages and disadvantages of agile:
The advantages of the agile model are:
- It is a client-focused process. As a result, it ensures that the client is constantly involved at all stages.
- Agile teams are highly motivated and self-organized, so they are more likely to produce better results from development projects.
- gile software development method ensures that development quality is maintained.
- The procedure is entirely based on incremental progress. As a result, the client and team are aware of what is and is not complete. This lowers the risk of the development process.
The disadvantages of the agile model are:
- Agile necessitates a high level of customer participation, which not all customers are comfortable with or prefer to provide.
- Agile assumes that every team member is completely committed to the project, which undermines the self-management principle.
- A time-boxed iteration may not be enough to accommodate all deliverables, necessitating changes in priority and additional sprints, which may result in delays.
- Agile suggests co-location for effective communication, and it's not always conceivable.
Advantages and disadvantages of waterfall:
The advantages of the waterfall model are:
- It is one of the simplest models to manage. Because of the nature of the project, each phase has distinct deliverables and a review process.
- It works well for smaller projects with easily understood requirements.
- Project completion will be completed more quickly.
- Both the process and the results are meticulously documented.
- Method for changing teams that is easily adaptable
- This project management methodology is useful for dealing with dependencies.
The disadvantages of the waterfall model are:
- Structure that is rigid enough to allow for necessary changes
- There is no exemption for uncertainty.
- Customer experience is low, resulting in low satisfaction.
- The sequential approach is not appropriate for a large-scale project with an end result that is too far in the future.
- Only at the end of the project is testing performed.
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Limitations of agile:
The limitations of the agile model are:
- It is an ineffective option for small infrastructure projects.
- Important decisions must be made in the meeting by an expert.
- When compared to other development methodologies, the cost of implementing an agile method is slightly higher.
- If the project manager is unsure of what outcome he or she desires, the project can easily detail.
Limitation of waterfall model:
The limitations of the waterfall model are:
- It is not a good model for a large project.
- It is a less effective method if the requirement is not clear from the start.
- It is extremely difficult to return to previous phases and make changes.
- After development is completed, the testing process begins. As a result, there is a high likelihood that bugs will be discovered later in development, when they will be costly to fix.
Comparison between Agile vs waterfall:
Here is the comparison between agile vs waterfall methodologies. They are:
- Agile divides the project development lifecycle into sprints where its waterfall model divides the project lifecycle into distinct phases.
- Agile adopts a linear approach whereas waterfall dopts the sequential process.
- Agile is mostly known for its flexibility and interoperability whereas waterfall methodology is a structured process.
- Agile can be thought of as a collection of various projects. In waterfall the development of software will be completed as a single project.
- Agile is a very adaptable methodology that enables us to be associated with the project development requirements even after the initial planning has been completed. In the waterfall model once project development begins, there is no way to change the requirements.
- Agile methodologies use an iterative development approach, so planning, development, prototyping, and other software development phases may appear multiple times.
- In the Waterfall model, all project development phases such as design, development, testing, and so on are completed only once.
- In agle after each sprint, the test plan is reviewed. During the testing phase in the waterfall model, the test plan is rarely discussed.
- Agile development is the process that expects requirements to change and evolve. The waterfall method is ideal for projects with specific requirements and unexpected changes.
- Testing is done simultaneously with software development in the Agile methodology. In waterfall the "Testing" phase follows the "Build" phase in this methodology.
- Agile incorporates a product outlook in which the software product meets the needs of its end users and adapts to their demands. The waterfall model demonstrates a project mindset and focuses solely on completing the project.
- Agile methodology works particularly well with Time and Materials or non-fixed funding. In fixed-price scenarios, it may increase stress. In waterfall, it lowers the risk in firm fixed-price contracts by obtaining risk agreement early in the process.
- Agile supports small but dedicated teams with a high degree of coordination and synchronization are preferred. In waterfall, coordination and synchronization within the team are severely limited.
- Every day during a project, the product owner and team prepare requirements. Business analysis prepares requirements prior to the start of a project.
- In agile the test team can easily participate in the requirement change.In waterfall it is difficult for the test to initiate any requirement change.
- In agile the project details description can be changed at any time during the SDLC process. The waterfall software development approach must be used in the detailed description.
- Members of the Agile Team are exchangeable, and as a consequence, they work more quickly. There is no requirement for project managers because tasks are performed by the entire squad. Because the process is always simple and clear in the waterfall method, the project manager is essential at all stages of SDLC.
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Both approaches are adoptable but only based on the customers or clients requirements.After determining the basic methodology to use, one can fine-tune the procedure to best suit our project objectives. Finally, while the manner in which we do our tasks is essential, really what matters is that we produce a solid and sustainable system that fits our customer.