by 
maazein
ANSWERS: 2
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If you don't mind...: "The waterfall model is a sequential software development model (a process for the creation of software) in which development is seen as flowing steadily downwards (like a waterfall) through the phases of requirements analysis, design, implementation, testing (validation), integration, and maintenance." http://en.wikipedia.org/wiki/Waterfall_model
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You will find the answer here. This tutorial explains software life cycle models in step by step lessons with case studies http://www.freetutes.com/systemanalysis
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