diff b/w waterfall model & spiral model?

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Question Posted / ramkrish_2009

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diff b/w waterfall model & spiral model?..

Answer / simran

The difference b/w Waterfall and Sprial Model are:
1) Risk factor is considered in the Spiral Model but in
water fall Model it is not considered.
2)In waterfall the requirements are freezed but this not
happens in the Spiral Model.
3)Water fall Model is linear sequential model where sprial
model works in loop.
4) Spiral Model is costely as Risk factor is covered.

Is This Answer Correct ?

136 Yes

11 No

diff b/w waterfall model & spiral model?..

Answer / dharshini

the difference between waterfall and spiral model are:
1)waterfall model is simple and sequential,but spiral model
is complex.
2)waterfall works in sequential flow,but spiral works in loop.
3)In spiral model there is a better communication between
developer and customer,but in waterfall model the customer
should have patience.

Is This Answer Correct ?

78 Yes

8 No

diff b/w waterfall model & spiral model?..

Answer / mb

WATERFALL MODEL:-

It is the simplest and oldest model that is widely used for
software development process. It states that phases are
organised in a linear order.
Waterfall Model is also known as 'Linear Sequential Model'
or 'Life Cycle Model' because it is systematic, sequential
approach to software development that begins at the system
level and progress through analysis, design, coding,testing
and support. Waterfall Model comprises of the following
phases:-
(1) Information
(2) Software Requirement Analysis.
(3) Design.
(4) Code Generation.
(5) Testing.
(6) Support

SPIRAL MODEL:-

It was proposed by Barry Bohem in 1988. It is an software
process model that attempts to combine the strengths of
various other models. It incorporates the elements of the
prototype driven approach alongwith the classic(waterfall
model) software life cycle. Unlike other models which view
development as a linear process. This model views it as a
spiral process. This is done by representing iterative
development cycle as an expanding spiral. In the spiral
model, software is developed in a series of incremental
releases. It is a realistic approach to the develpment of
large scale software. Sectors of spiral model:-
(1) Planning(i.e., Determine objectives, Alternatives,
Constraints).
(2) Risk Analysis(i.e., Evaluate alternatives, Identify,
Resolve risk).
(3) Deve;lopment(i.e., Develop, Verify next-level product).
(4) Customer Evaluation

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Is This Answer Correct ?

47 Yes

4 No

diff b/w waterfall model & spiral model?..

Answer / tejinder singh

waterfall model is a rigid model and can easily be
manageble but spiral model is not

waterfall model works well on smaller projects whereas
spiral model woks on larger projects also

waterfall model is a iterative process whereas spiral model
is a partitioned in four quadrants it is also called meta
model.

Is This Answer Correct ?

37 Yes

6 No

diff b/w waterfall model & spiral model?..

Answer / k.chandra sekhar

a) When the customer or client requirements clear then
that time use the waterfall model
g) Spiracle model is nothing but version by version
model
h) The project have so many risks then
i) Client requirements changes continuous then use
this project

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Is This Answer Correct ?

59 Yes

32 No

diff b/w waterfall model & spiral model?..

Answer / dariush

Waterfall Model:
-Series of stages carried out in sequence
-Products of each stage subject to QA inspections
-Only if the products are acceptable is the stage signed off
and the next allowed to start
-Each new stage starts from an agreed baseline established
at preceding stage
-In reality stages will overlap
-No stage is repeated unless a radical change of project scope
-Waterfall may provide a good starting point for structuring
the project
-Can be useful for inexperienced practitioners
Easy to build a simple plan around

Spiral Model:

-When requirements are not well known in advance spiral
model may provide an alternative
-An iterative approach to developing a system
--High level requirement specification is drawn up
--Tested by building a prototype solution
--Prototype is reviewed and requirements are clarified or
changed and amended requirements specification is issued
-The cycle is repeated until requirements are stable and
users approve the deign
-At the beginning of the spiral the focus is on requirements
issues
-At the end concentrates with technical issues
-Iterations can spiral out of control if not tightly managed
--Each iteration will lead to requests for change
--Difficult to call a halt to the process resulting in
projects running late and over budget
-Scope can be difficult to manage
-Final solution can be inadequately documented and poorly
structured
--Prototypes can be viewed as tool for capturing
requirements eliminating design stage
-Can lead to false user expectations
-Early prototypes raise expectations that final solution is
imminent

Is This Answer Correct ?

26 Yes

8 No

diff b/w waterfall model & spiral model?..

Answer / jocelyn mathew

In water fall model,we will not come to know about the
output unless all stages are over whereas,in spiral model,we
will know the final output almost in the beginning itself as
it is a output driven method because they act according to
the clients requirements and complete their project with the
testing process done at the each stage.

Is This Answer Correct ?

17 Yes

3 No

diff b/w waterfall model & spiral model?..

Answer / supriya chakraborty

1) In spiral model parallel work of many activities has
higher chance to carry out specially after the first
iteration. That enforces shorter deadline for version
management.

practice and literature definition support very less
parallel activities. That ultimately enlarge the deadline.

Is This Answer Correct ?

12 Yes

5 No

diff b/w waterfall model & spiral model?..

Answer / muxiyadiin

water fall is the oldest and mostly used model in the field
of software development.
spiral model is one of the models that is used for major
tasks and more complex than that of waterfall model.

Is This Answer Correct ?

6 Yes

2 No

diff b/w waterfall model & spiral model?..

Answer / pawan kumar

1.)spiral model includes more customer attention or
interaction rather than waterfall model.
2.)In spiral model we use loop approach while in waterfall
model we have a sort of linear,conventional approach.
3.)In waterfall model we cannot go to the previous stage,but
in spiral model we can go to the previous stage.
4.)spiral model is also known as 'Bohem Model' and waterfall
model is also known as 'linear sequential model'.
5.)waterfall model is simple and sequential ,but spiral
model is not so simple due to loops.
6.)waterfall model works in sequential flow,but spiral model
works in loops.

Is This Answer Correct ?

4 Yes

1 No

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