The main focus while writing test cases should be to cover all the documented requirements, a rudimentary form of doing this is by specifying the exact requirement number/id against every test case. A better way of doing this is by preparing a Traceability Matrix

We should also try and write which cover the implicit requirements along with the expliocit stated ones, some negative test cases to cover unpredicatable scenarios. Effort should be made to test all possible inputs and to apply whatever domain knowledge the tester has.

The test cases should follow a logical flow, and should include all the information required for executing the steps. The writing style should be easy to understand, all these points make it easy for the reviewer to review the test cases, and also help in easy execution of test cases as they might be executed by another person.

The template for writing the test cases should also be followed preperly and all columns should be filled in with the required information.

Water fall model is a sequential model which is use for (SDLC)whole software dev. process, in this process is going through by step by step like after the completion of REQ. phase we can go to DESIGN phase thn coding , thn TESTING. so it is time consuming .now a days most of the comp. use SPIRAL MODEL.
V-MODEL is a model which is use for TESTING process (STLC)whci covers all the testing levels parallely with the software dev.

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