Write the bug report just when you are sure that you have found a bug, not after the end of test or at the end of the day. It might be possible that you might miss out on many crucial points if you are delaying the write up for bug filing . Worse, you might miss the bug itself. Put necessary time to diagnose the defect you are reporting. Think of the possible causes. You might land up uncovering more defects if there are any . Mention your discoveries in your bug report. The programmers will only be happy seeing that you have made their job easier. Take some time off before reading your bug report. You might feel like re-writing it.