Too little focus on soft skills is a common cause of frustrations in a workplace. Those skills are essential for a successful performance in any interpersonal setting, from very large multinationals to small SMEs. They are crucial in every business. To help companies and their employees, we have – based on our experience – identified twenty-five skills that we believe have the greatest impact on the (professional) success of your employees. We have made a distinction between different career phases. After all, a career starter typically has different needs than an employee with more years of experience or somebody who will soon manage a team. By offering employees an opportunity for personal growth and development will result in more effective and happier employees, who will also be tempted to stay longer at your organisation.