Which of the following is not true of regression testing?

The assertion that regression testing serves to demonstrate that the changed software works as intended is not true because regression testing primarily focuses on ensuring that the existing functionalities of the software remain unaffected after changes such as enhancements, bug fixes, or other modifications. Its core objective is to verify that these changes haven't introduced new defects into the already functioning parts of the software.

While it could indicate that the software still operates correctly after the modifications, regression testing alone does not confirm that the new changes are functioning as intended; this would typically fall under integration or acceptance testing, where the focus is on validating new features or enhancements.

The other aspects of regression testing are accurate. It can indeed be performed at various stages of the software development lifecycle, ensuring continuous quality as changes occur. The purpose of regression testing also includes verifying that no unintended changes have been made to existing functionalities, highlighting the necessity of testing previous functionalities after modifications. Additionally, automation is a common practice in regression testing, as it allows for efficient and repetitive execution of test cases, improving scalability and speed during the testing process.