Running a business can be a pretty tough time. There is so much to think of and so much to plan, prepare, organise and decide. And, more often than not, there is plenty of room for mistakes. Mistakes are fine, as they teach you a valuable lesson, but that is only true if you are willing to learn and to rethink your strategy. Sometimes you may not even know that you are doing anything wrong. You may blame the lack of success – not every mistake ends in a failure, it could just be a smaller success than you would have expected – on the market situation, the stressful environment at work, or simply bad luck. But before you look into further excuses, let’s examine three main types of business mistakes that are damaging your ROI: The mistakes that are caused by a lack of knowledge, the mistakes caused by an incorrect knowledge, and the mistakes caused by an outdated knowledge.