Even the most carefully planned and designed software, cannot possibly be free of defects. Your goal as a quality engineer is to find these defects. This requires creating and executing many tests.

In order for software testing to be successful, you should start the Software Testing process as soon as possible. Each new version must be tested in order to ensure that �improvements� do not generate new defects. If you begin Software Testing only shortly before an application is scheduled for release, you will not have time to detect and repair many serious defects. Thus by Software Testing ahead of time, you can prevent problems for your users and avoid costly delays.