Coming to the point, now this article will discuss the details, why use, advantages, and disadvantages of both the implementation methods.
What is Waterfall Model
Before you know why to use falls model, in simple words understand what it is. Every development cycle begins with collecting the requirement, designing, developing, testing, deploying, and maintaining. This, when done in steps waiting for each step to get over, is called the waterfall method
. Can you imagine how the water flows in a falls? It happens from the top to the bottom. The reverse will never happen. Similarly, going back to the previous step is not possible in the waterfall model.
With this basic info let us proceed to understand why to use this model.
- Why use a Waterfall Model
It is easy to understand and implement. This robust system is preferred in places where taking risk is not affordable. For instance, in places where human life is involved in development, then this model is a fool-proof one as the complete planning is done before implementation.
Even today defense projects are executed using this method.
The stringent standards followed in this approach leave no room for errors and hence cost is saved.
Understanding requirement thoroughly helps to plan contract and delivery in advance. Government projects prefer traditional way as it is attuned with the attainment and meticulous oversight process.
Overall, the linear-sequential life cycle model as the name implies each step occurs in sequence and easy to comprehend.
Managing deliverables are direct as each phase has a defined process. There is no overlapping of phases and allows completion in a phased manner.
Small projects with the well-defined requirement and clear expectation can go with this model for a perfect outcome with minimal expenses.
- Disadvantages of the Waterfall Model
Needless to say, this method has a major setback in the testing phase. It is not that the testing method is wrong but due to lack of chance to revisit will not only consume time but also entire work must be reworked. For instance, when testing and development happens concurrently, then fixing issues becomes possible. This facility is not available in this method which leads to chaos in huge projects.
Working software model cannot be seen and the client has to wait until the end to see the result. Therefore using this in object-oriented projects or complex projects will lead to risk.
Dynamic requirements can never rely on this method as a change in the requirement is not allowed during the middle of the project.
All this obviously conveys that the cost of implementing using the waterfall method is high in case of any issue cropping in any stage of development.
What is Agile Methodology
Agile means are responsive. From that meaning, it is easy to interpret that this model will allow the team to respond with their concerns at any stage. Therefore, corrections can happen and then proceed with development. This will allow for modification as the entire process will be divided into iterations and hence each iteration is a small development life cycle. Since each cycle is independent of each other client can request a change at any stage.
Now, understand the agile model in technical terms. Agile is also called an incremental model. Several frameworks are used to implement the agile method. Scrum is the most used one in which the entire project is divided into sprints and the planning will happen per sprint and not for the whole project. Each sprint will last for not more than 2 weeks and the team gathers to explain the status. What went wrong is discussed and the backlog is moved to the next sprint. The daily meeting will allow the team to discuss and continue. This leads to a transparent development process and there is no room for surprises from any stakeholder.
Scrum training offers detailed education about how to effectively implement the agile model in projects.
- Benefits in the Agile model
Teams meet daily and hence all communication is weeded out. Everyone feels empowered and hence work with unity.
Implementation happens in stages and hence the review of the end product is visible to the customer which helps them to fine tune their expectation. This means there is no need for additional investment in development and customer can add inputs in the middle of the project.
People are important than the process so there is no rigid rule in what is to be done and when. Especially the quality team takes equal right like the development team and they can also share their views.
Even when the scope of the requirement is not known, the agile method allows the team to start the process. In short, the agile method can be used in small and medium-sized projects which require changes till the end of producing the end final product.
Obviously, time and money are saved and there is no concern about untimely optimization.
- Any downfalls in Agile model?
1.Report writing takes a back seat and hence new team member finds it difficult to get along in the project.
2.Complex projects become more complex as timelines are not clearly defined in the beginning.
3.The client might take advantage and not come with a proper requirement definition leading uncertainty among developers.
Waterfall model ideally suits
•When the client clearly mentions what they want, then go with the waterfall model and travel through each step one at a time.
•Every stable defined product can be developed with the traditional model.
•If understanding technology is the key to development, then this model will help.
•When resources are available with ample time and expertise, then allot them in this way as they will implement without any downfall at any stage.
•Customer interaction is limited and projects that do not require their input can adopt this method.
The right time to adopt Agile Methodology
•Use agile way when there is a dynamic environment and client wants to review each stage to decide on the next stage.
•When the team requires freedom, then this way will make them feel independent. Every individual can share their view.
•It is more of a mindset and hence new team members can be trained in an agile way and they can quickly adapt to the method.
•When there is a huge project and you don’t want to lose on the client, then choose the agile way and complete modules until the client comes back with their complete requirement.
•At the time of limited resources available with expertise, then swap them between the project as each person can work on the selected module. They may not be required during the entire development phase.
•Testers and developers can change seat as both will learn all the process since they work concurrently.
Difference Between Agile Vs Waterfall Model