Task 1 - System Analysis Development Contents Task 1.2 Task...

System Analysis Development
Contents
Task 1 ..................................................................................................................................................... 2
Task 1.1 (P 1.1) Evaluating SDLC Models ........................................................................................ 2
Waterfall model .............................................................................................................................. 2
Spiral Model ................................................................................................................................... 4
Iterative Model ............................................................................................................................... 6
Prototype Model ............................................................................................................................. 7
RAD Model .................................................................................................................................... 9
Agile Model .................................................................................................................................. 11
Task 1.2 (P 1.2)(M 3.3) ........................................................................................................................ 13
SDLC Comprises of the Following Stages: ..................................................................................... 13
Importance of SDLC ........................................................................................................................ 13
Task 1.1.1 (M 1.1) ................................................................................................................................ 14
Task 1.1.2 (D 1.1) ................................................................................................................................. 15
Task 1.3 (M 2.3) ................................................................................................................................... 16
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System Analysis Development
Task 1
Task 1.1 (P 1.1) Evaluating SDLC Models
Waterfall model
The waterfall model is earliest approach Model this Model was Used for Development. The any
phase in the software development process will start only when the previous phase will complete.
And this waterfall model phases do. This waterfall model is the first SDLC model to use in software
engineering to make sure the success of the projects. The waterfall model will approach all process
of software Development was categorist in to sparest phase.
 Advantage
o This model is simple and easy to understand and use.
o It is easy to manage due to the rigidity of the model – each phase has specific
deliverables and a review process.
o In this model phases are processed and completed one at a time. Phases do not
overlap.
o Waterfall model works well for smaller projects where requirements are very well
understood.
 Disadvantage
o Once an application is in the testing stage, it is very difficult to go back and change
something that was not well-thought out in the concept stage.
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Figure Waterfall

System Analysis Development
o No working software is produced until late during the life cycle.
o High amounts of risk and uncertainty.
o Not a good model for complex and object-oriented projects.
o Poor model for long and ongoing projects.
o Not suitable for the projects where requirements are at a moderate to high risk of
changing.
 Application
o This model is used only when the requirements are very well known, clear and fixed.
o Product definition is stable.
o Technology is understood.
o There are no ambiguous requirements
o Ample resources with required expertise are available freely
o The project is short
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System Analysis Development
Spiral Model
In the spiral model has some combines the idea of iterative development with the systematic,
command aspects of the waterfall model and spiral model is a combination of the iterative
development process model and sequential liner development model waterfall model with very high
emphasis on the risk analysis and it allows for the increment releases of the product

Advantage
o
High amount of risk analysis hence, avoidance of Risk is enhanced.
o
Good for large and mission-critical projects.
o
Strong approval and documentation control.
o
Additional Functionality can be added at a later date.
o
Software is produced early in the software life cycle

Disadvantage
o
Can be a costly model to use.