We write test cases to find the errors in the project and 
rectify them and produce the good quality product to the 
client.

Test case is a document specifies set of inputs and 
expected results to identifies the defects aganist to the 
application

Understand the correct reason:

Reasons Test case writing

How the tester understood the system functionality.

Systematic steps that follow to test each feature of system.

if any new man come for testing,he can execute the test 
cases by reading step by step process.

It will avoid illusions ans ambiguity of the system 
functionality,bcoz after writing testcases senior people do 
review on the test cases.

It is proof for testing team that every function traced

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rajendra

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Test case is a document which specifies set of input data 
and expected result which is used to test the application 
for the intension of finding bugs.