There is a saying about doctors - every doctor has his own "little cemetery". And it is the same for QA engineers: every one of us can recall different embarrassing situations when the mistakes that went unnoticed and weren't detected in time caused a lot of problems to users. I've been working for 4 years and my own "little cemetery" has grown quite big. I decided to dedicate my report to this experience. And even though it is good to learn from mistakes, I hope that you will get some feedback from this report and will be able to reduce the number of your own mistakes.