Your answer to this question should contain a systematic, well-tested methodology for identifying and correcting software development defects. You may want to discuss using agile methodologies and including quality assurance and quality control practices in the development process. As with any operational question, providing the interviewer with an example of how you have successfully accomplished this will strengthen your answer.

"My goal during any software development project is to reduce the number of defects and deliver an error-free product. I do this in several different ways. I prefer to use the agile methodology, which allows me to identify errors and bugs in the code at each stage of the project. My team and I then correct these before moving on to the next stage so that the errors are not compounded. Other techniques I use include quality assurance throughout the project and turning the product over to a quality control team as the last check for any errors my team and I may have missed. Together these practices always result in a bug-free product that meets the client's specifications."