Testcase must be simple,easy to execute even for novice 
tester.
Testcase should have clear one to one user action-expected
result relation.
Testcase should have the vallid/context sensitive/model
input specification
Testcase should not have more than 8 steps.
More number of requirements should cover with less number 
of testcases this leads to less test execution tyme.
Each requiremnt should have minimum one test case(This can 
be easily done by using traceability matrix).
testcase must be designedin a  reusable manner.
testcase must be disgned to update/modify easily.

thats' all

all above are the testcase validation criteria

byee

Rajendra Prasad Reddy

rajendra_penumalli@yahoo.com

Hi, Iam Rajesh Ahirrao here...
Rajendra Prasad is partially correct,I want to add some 
more comments in that.
1) Test Case should have Pre-requisite
2) Test Case should have detailed description.
3) Test Case should not have more than 7 steps.(As per 
SQTR) (S/W Quality Testing Rule).
4) Test Case should be clear,self explainatory.
5) Test Case should be in proper format like, Pre-
requisite,description,Expected result and Actual result.
6) Test Case should cover max.functionality..
So we can validate the Test cases which meets all bove 
points...

Please suggest, if I am wrong.

Thanks,
Rajesh Ahirrao ...
ahirrao.rajesh@gmail.com