Tired of saying "That's not in the requirements", "Works on my machine" or "It has always worked before"? With 12 years of experience as a developer and almost as many in Testing/QA Lena has collected a large tool kit and a lot of experience to aid her when figuring out a new application or test new functionality. Something she noticed along the way is that the same types of bugs are found over and over again regardless of team, tech or type of system. Over the years she has spent a lot of time showing the developers how to find these common problems themselves so that she can focus on finding the nastier stuff underneath. Now it is YOUR turn to learn! Lena will go through her top ten tips (plus a few bonuses) for anyone who wants to know how a tester thinks, what types of bugs are usually always found and basically give you a chance to avoid angry testers thinking you should have tested your code better.