A defect which is not permitting to continue further testing is called Showstopper Defect
What is a test plan?
What is a test case?
What should be done after a bug is found?
What is configuration management?
What if the software is so buggy it can�t be tested at all?
What if there isn�t enough time for thorough testing?
What if the project isn�t big enough to justify extensive testing?
What is the difference between structural and functional testing?
What is 'configuration management'?