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Video Title: Spiral Model
Description: Spiral Model
Watch more Videos at https://www.tutorialspoint.com/videotutorials/index.htm
Lecture By: Mr. Arnab Chakraborty, Tutorials Point India Private Limited
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In our Software
Development Paradigm, we are going to

discuss another
model that is known as the SPIDEL model.

So, now let us discuss this SPIDEL model.

What is a SPIDEL model?

We shall discuss it with a proper diagram.

Then we shall discuss the strengths and
weaknesses and where to use or when to use

this SPIDEL model.

So, look at this very diagram.

Here you can find
that this particular

software development
process has got initiated.

We are having risk management,
prototypes, design, code, integration,

test and implementation.

So, this section we are considering under
product development.

And now, one release will be obtained to
the client.

So, that client can use it.

And here you see, we are having the next
phase planning.

And then, we are going for the review.

Then, objective identification.

Then, cumulative cost.

Again, the progress will be initiated.

And then, alternate evaluation will be
done.

And then, again, we are going for this
product development phases.

So, in this way, the SPIDEL model will
work.

And you can particularly look at this
particular figure and you can find that

this risk management, is taken care of in
case of SPIDEL model.

So, that is the uniqueness in SPIDEL
model.

So, SPIDEL model is a combination of both
iterative model and one of the SDLC model.

And this is the iterative model means it
will go on doing in iteration.

Iteration means looping.

And one of the SDLC model.

So, it can be seen as if you choose one
SDLC model and combine it with cyclic

process that is the iterative model in
this case.

So, here you are selecting one of the SDLC
models and the iterative model.

So, these two models are getting combined
to give you the shape of this SPIDEL model.

Now, in this respective slide,
we are mentioning that very vital point

that this model considers
risk and which often

goes unnoticed by
most of the other models.

This model starts with determining the
objectives and the constraints of the

software at the start of the of the
iteration.

And next phase is to prototyping the
software and this includes risk analysis.

So, then one standard SDLC model is used
to build the software in the fourth phase

of the plan of the next iteration is
prepared.

So, as we have mentioned here.

So, here we are having one, two,
three, four different phases are there.

And here this this is the software or the
product development phase which is having

one of the SDLC life cycle model can be
implemented here for design, coding,

integration, testing and implementation.

Then release will be
obtained and this process

is iterative because
it will go on looping.

Iteration means looping and here we are
having the next planning and then the

objective will be identified and the
cumulative cost and the progress will be

obtained and again the process will be
repeated.

So, now let us
go for the strengths, drawbacks and

the where
to use, when to use this spiral model.

So, we are discussing spiral model
strengths.

So, what is developed at first?

If it is a question,
then obviously our answer should be that

critical high risk
functions are to be developed at first.

Why?

Because if we can, if we can develop the
high risk components at first,

So, what will happen?

As we are implementing the high risk
components or the functions at first,

then what will happen?

If there is some failure
in the development,

then that will be a less
costly affairs for us.

So, this model provides early indication
of existence of risks without much cost.

How does the user benefit?

So, answer is users can be closely tied to
all the life cycle steps.

Users see the system early because of
rapid prototyping tools and early and

frequent feedback from the users will
enrich this development process to get

lead to the
actual development according to the

requirements and
expectation of the customers.

Now, we are discussing spiral model
weaknesses.

What is the impact of using spiral model
for small or low risk projects?

Time spent for evaluating risks too large
for small or low risk projects.

So, time spent
planning, resetting objectives, doing

risk analysis and prototyping
may be excessive.

So, that these are the disadvantages and
drawbacks of this spiral model.

So, judging the risk analysis,
doing the risk analysis, finding the most

risky model which is to be implemented at
first and also doing the prototyping will

be the excessive extra work for us.

So, can spiral model be considered simple?

If it is a question, the
answer is the model is

complex and
expertise is required in which area?

The answer is risk assessment expertise is
highly required in the proper

implementation of the spiral model.

So, in this
discussion, we have discussed lots of

issues on the
spiral model with a proper diagram.

Thanks for watching this video.

TutorialsPoint.com.

Simply easy learning.

Ummm, may you-two.