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diff b/w waterfall model & spiral model?

Answer Posted / 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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