Iterative Waterfall Model with example in Hindi

Summary

The iterative waterfall model, a modification of the classical waterfall model, introduces feedback mechanisms to address issues that arise during later stages, preventing them from propagating further. Unlike the classical model, which lacks feedback, the iterative version allows for changes based on detected problems in testing or design phases. However, feedback is not present in the feasibility study phase. The model retains the simplicity and ease of the base model, making it suitable for small projects. Despite the addition of feedback, it still suffers from the same disadvantages as the classical model, including no phase overlapping, no intermediate delivery, rigidity in requirements, and less customer interaction.

Takeaways

• 🔄 **Iterative Waterfall Model**: A modified version of the classical waterfall model that includes feedback mechanisms.
• 🔁 **Feedback Mechanism**: Allows for the detection and correction of issues in later stages by communicating back to earlier stages, unlike the classical model.
• ⛔ **No Feedback in Feasibility**: Once a commitment is made in the feasibility study, there's no turning back, emphasizing the importance of initial decision-making.
• 📉 **Advantages Retained**: The iterative model retains the simplicity and ease of the classical model, making it suitable for small projects.
• 🔒 **Rigidity in Requirements**: Despite feedback, the model maintains a rigid structure where requirements, once set, are not easily changed.
• 🚫 **No Phase Overlapping**: Each phase must be completed before the next begins, preventing parallel development.
• 🚚 **No Intermediate Delivery**: The product is delivered in its entirety upon completion, with no partial or prototype deliveries in between.
• 🤝 **Limited Customer Interaction**: Customer interaction is minimal, with most engagement occurring at the beginning and end of the project.
• 🔍 **Focus on Detection and Correction**: The model emphasizes the importance of detecting and correcting errors as they arise, rather than waiting until the end of the project.
• 📋 **Documentation Importance**: The script implies the significance of proper documentation, such as the SRS document, in guiding the development process.

Q & A

What is the iterative waterfall model?

The iterative waterfall model is a modified version of the classical waterfall model, which incorporates feedback mechanisms to address issues detected in later stages of the software development process.

How does feedback work in the iterative waterfall model?

In the iterative waterfall model, feedback allows for the detection of problems in later stages, such as during testing, and the communication of these issues back to earlier stages, like design or coding, for necessary revisions.

What is the main difference between the classical waterfall model and the iterative waterfall model?

The main difference is the inclusion of feedback in the iterative model, which was absent in the classical model, leading to the propagation of errors through stages without the possibility of correction.

Are there any stages in the iterative waterfall model where feedback is not applicable?

Yes, feedback is not applicable in the feasibility study stage of the iterative waterfall model, as once a commitment is made to develop the software, it is expected to be followed through.

What are the advantages of the iterative waterfall model?

The advantages include simplicity and ease of use, suitability for small projects, and the introduction of feedback to correct mistakes, which was a limitation in the classical model.

What are the disadvantages of the iterative waterfall model?

The disadvantages include no phase overlapping, which means a linear progression without parallel work, no intermediate delivery of the product, rigidity in requirements that are not easily changed once set, and less customer interaction.

How does the iterative waterfall model handle requirements changes?

The iterative waterfall model allows for feedback to correct issues but does not support frequent changes in requirements. Once requirements are fixed, they are expected to remain unchanged throughout the project.

Can you explain the concept of 'no phase overlapping' in the iterative waterfall model?

No phase overlapping means that each phase of the software development process must be completed before the next phase can begin, preventing parallel work and the ability to work on multiple phases simultaneously.

What does 'no intermediate delivery' imply in the context of the iterative waterfall model?

'No intermediate delivery' means that the software product is delivered to the customer only after the entire development process is completed, with no partial or prototype deliveries in between.

How does the iterative waterfall model affect customer interaction?

Customer interaction is limited in the iterative waterfall model, as the customer's involvement is mostly at the beginning for requirement gathering and at the end for the final product delivery, with minimal interaction during the development stages.

Is the iterative waterfall model suitable for complex projects?

The iterative waterfall model may not be suitable for complex projects due to its rigid structure and lack of flexibility in handling changes and customer feedback throughout the development process.

Outlines

00:00

🔄 Iterative Waterfall Model Overview

The paragraph introduces the iterative waterfall model as a modified version of the classical waterfall model. It emphasizes the addition of a feedback mechanism, which allows for the correction of mistakes or issues detected in later phases by informing earlier phase teams. This is a significant departure from the classical model, which lacks such feedback, leading to the propagation of errors. The paragraph also notes that feedback does not occur during the feasibility study phase, suggesting a commitment to the project's continuation once the decision to proceed is made. Advantages of the iterative model include its simplicity and suitability for small projects, while disadvantages mirror those of the classical model, such as the lack of phase overlapping, no intermediate delivery, rigidity in requirements, and limited customer interaction.

Keywords

💡Iterative Waterfall Model

The Iterative Waterfall Model is a software development process that builds upon the traditional Waterfall Model by incorporating feedback mechanisms. It allows for revisions and improvements at various stages of the development process. In the video, this model is described as a 'modified version of classical' with a 'major change' being the introduction of feedback, which was absent in the classical model.

💡Feedback

Feedback in the context of the Iterative Waterfall Model refers to the ability to report issues or suggestions from later stages back to earlier ones for correction or improvement. The video highlights this as a 'major change' in the model, where problems detected in testing phases can be communicated back to the design or coding teams for necessary changes.

💡Classical Waterfall Model

The Classical Waterfall Model is a linear and sequential software development process where each phase must be completed before the next one begins. It is mentioned in the video as the basis for the Iterative Waterfall Model, with the key difference being the lack of feedback in the classical version, leading to problems propagating through stages.

💡Problem Propagation

Problem Propagation refers to the spread of issues or errors from one phase of the software development process to subsequent phases. The video explains that in the classical model, without feedback, any mistake made in one stage would continue to affect later stages, which is a problem the Iterative Waterfall Model aims to address.

💡Feasibility Study

A Feasibility Study is an initial phase in the software development process where the practicality of a project is assessed. The video specifies that in the Iterative Waterfall Model, unlike other stages, there is no feedback from the feasibility study phase, indicating a commitment to the project once it is approved.

💡Phase Overlapping

Phase Overlapping, or the lack thereof, refers to whether different stages of the software development process can occur simultaneously. The video mentions that in the Iterative Waterfall Model, as with the classical model, there is 'no phase overlapping,' meaning each phase must be completed before the next begins, which can hinder efficiency.

💡Parallelism

Parallelism in software development refers to the ability to work on multiple phases of a project at the same time. The video script uses 'parallelism' as a contrasting term to the sequential nature of the Iterative Waterfall Model, where one phase must finish before another can start, indicating a limitation of the model.

💡Intermediate Delivery

Intermediate Delivery is the concept of providing partial or incomplete versions of the software to the customer for feedback or testing before the final product is completed. The video points out that in the Iterative Waterfall Model, as in the classical model, there is 'no intermediate delivery,' which means the customer only sees the product once it is fully developed.

💡Rigidity

Rigidity in the context of the Iterative Waterfall Model refers to the inflexibility to change requirements or specifications once they have been set. The video script mentions 'rigid no changes' to emphasize that once requirements are fixed, they are not easily altered, even with the presence of feedback mechanisms for other aspects of the model.

💡Customer Interaction

Customer Interaction is the engagement with the end-user to gather requirements, provide updates, or receive feedback on the software development process. The video script notes that in the Iterative Waterfall Model, customer interaction is limited, with the customer primarily involved at the beginning and end of the project, rather than throughout the development process.

Highlights

Introduction to the Iterative Waterfall Model as a modified version of the classical waterfall model.

Emphasis on the introduction of feedback in the iterative model, which was absent in the classical model.

Explanation of how feedback allows for the correction of mistakes in earlier stages, preventing them from propagating to later stages.

Clarification that feedback is not present in the feasibility study phase, once a commitment is made, it is not revisited.

Advantages of the iterative model include simplicity and ease, making it suitable for small projects.

The additional concept of feedback in the iterative model as a key differentiator from the classical model.

Disadvantages such as no phase overlapping, which means phases are completed sequentially without parallelism.

Lack of intermediate delivery, where the software is delivered only after the entire project is completed.

Rigidity in requirements, where once requirements are set, they are not easily changed in later phases.

Limited customer interaction, with customers only seeing the product upon completion and delivery.

The iterative model's inability to provide partial or prototype deliveries for customer feedback before the final product.

The iterative model's retention of the classical model's disadvantages, such as rigidity and limited customer interaction.

The importance of remembering the main differences between the classical and iterative waterfall models for exams.

A quote from Salman Khan is used to illustrate the concept of commitment in the feasibility study phase.

The iterative model's feedback mechanism allows for changes based on detected issues in later stages.

The iterative model is recommended for its simplicity and suitability for small projects, with feedback as a key enhancement.

Transcripts

Dear students welcome to Gates Smashers

I'm going to explain what is iterative waterfall model

In last video we had talked about classical waterfall model

What are the advantages and disadvantages

So this iterative waterfall model

It is a modified version of classical

And in modification one of the major modifications that has done

That is the feedback

Because in classical feedback system was not there

That means if any mistake is done in one particular stage

If any problem comes

It will keep on propagating in further stages

But over here the major change that they have done

That in case if any problem occurs

And lets say I detected that problem encoding or testing phase

I can say that lets say a detected it

That there is some problem in design

So over here I can give a feedback and tell the design team

That you can perform some changes in this

In the same way if I saw any changes in system testing

Or lets say if I want some changes in that

Then at backend I can tell the design team or coding team

So this is the major change of feedback

Which is there in the iterative waterfall model

So if you are asked anywhere in university exam

In college university or India competitive exam

Then remember this main point

This is the major difference

The second point is that over here there is no feedback in feasibility study

Your feedback works this way only

But in feasibility study there is no feedback

What is the meaning

Once you have given the commitment

There is a dialogue of Salman Khan that

If I have given commitment once then I don't listen even to myself

The same thing is over here also

That if you have given the commitment once that yes you will develop the software

Now you cannot backtrack

This is the basic concept over here

Feedback one

If we talk other than that the other points are same only

The advantages which were there like base model

Simple and easy

It is good for small projects

Which one is extra? Feedback

Which is one extra concept over here

Feedbacks are there in the iterative waterfall model

If you talk about the disadvantages then the remaining disadvantages which were there

Same exists over here also

Like no phase overlapping

What is this? Parallelism

In that parallelism was written

So over here no phase overlapping

That means one phase will complete after that another phase will start

Then the 3rd one then the 4th one

That means you cannot work parallelly at a time

This is the problem in it

Then no intermediate delivery

What is the meaning over here

That you have started a project

From feasibility study to maintenance

When this whole software will get completed

Then you will deliver it to your customer

After completing the work you delivered

In between there is no partial delivery

What is the meaning

Let's say if any problem comes

Customer can find that problem

Then that problem can be highlighted only after delivering the whole software

If there is any intermediate or prototype kind of concept

That I make a small prototype and give it to them

And that only I say that tell some changes

Which will come ahead in the prototype model

So that would have been a bit advantage over here

But this thing is not like that

Then what is the meaning of rigid no changes over here

If you talk about no changes or rigidity

Then let's say I have fixed the requirement

That these are my requirements

Then those requirements are fixed

I have freezed them in a way

If I want to do any changes in your requirement in next phases

Then it cannot be done

Baby you will feel like that Sir feedback is there in it

So what is the concept of feedbacks it is that

If there is any mistake or any bug comes

Then we can say the previous team that there is some problem over here

But if I freezed the requirement

That these are my requirements

Once my requirements have been fixed

After that I cannot bring changes in them again and again

So this rigidity is still there

Less customer interaction

Office here told you earlier also about customer interaction

That we have asked the customers over here

We have got the SRS document signed

After that the customer will directly come over here

Because when the product will be delivered to him at that time he will actually use it

You will deliver the whole software in one time

So you can tell them as major facts or major points

In the iterative waterfall model

There is nothing out of this

Even if you know these many points

It is more than sufficient

Thank you