Regression Testing

Regression Testing


  • All aspects of system remain functional after testing.
  • Change in one segment does not change the functionality of other segment.



  • Determine System documents remain current
  • Determine System test data and test conditions remain current
  • Determine Previously tested system functions properly without getting effected though changes are made in some other segment of application system.

How to Use

  • Test cases, which were used previously for the already tested segment is, re-run to ensure that the results of the segment tested currently and the results of same segment tested earlier are same.
  • Test automation is needed to carry out the test transactions (test condition execution) else the process is very time consuming and tedious.
  • In this case of testing cost/benefit should be carefully evaluated else the efforts spend on testing would be more and payback would be minimum.

When to Use

  • When there is high risk that the new changes may effect the unchanged areas of application system.
  • In development process: Regression testing should be carried out after the pre-determined changes are incorporated in the application system.
  • In Maintenance phase : regression testing should be carried out if there is a high risk that loss may occur when the changes are made to the system


  • Re-running of previously conducted tests to ensure that the unchanged portion of system functions properly.
  • Reviewing previously prepared system documents (manuals) to ensure that they do not get effected after changes are made to the application system.


  • Time consuming and tedious if test automation not done

Comments (1)

Said this on 12-28-2007 At 10:58 am
Provide the comparision of regression testing with retesting etc
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