First held at the DevCom Conference in Cologne, August 2019. Since the early days publishers and development teams have always sought the most diverging approaches on their way to the top during times of prosperity. However, the mistakes that led to the downfall of quite many of them are surprisingly identical and few in numbers on the other hand. History seems to be repeating itself year after year. And this becomes the more obvious the longer you work in this crazy industry. In this talk I tried to illustrate the 10 most commonly made mistakes I saw studios of all shapes and sizes repeatedly do again and again throughout my more than 25 years long lasting career, independently from any platform, genre or business model.