In heterogeneous societies, walls are standing between groups. Sometimes physical walls but most of them are invisible. These walls cause a typically human behaviour: the we vs them thinking. Instead of talking with each other, we start talking about the other. Based on assumptions and labels we create, dealing with the identity of the other, but meanwhile mainly intending to reinforce our own identity. The we vs them thinking is more about ourselves then it is about the other. And, as Bart Brandsma, expert on polarisation, explains it is often about similarities instead of differences, though we focus on the latter. To put it more strongly: we are inclined to focus on the differences, because the idea that the other appears to be almost the same as yourself is sometimes unbearable. What if they would acknowledge that we often have a similar aim and desire and start to think about sharing instead of fighting each other and accusing each other of all kind of things, based on perceived differences, identities and stereotypes? It requires courage to share, it is way easier to stay in your trench and to shoot at each other, either verbally of physically. It needs a change in behaviour and a change in the system, as people tend to choose the easy way over taking a little more effort. Certainly when the result is not always immediately and easily measurable. Nevertheless, this behavioural change is what we constantly intend to do in our applied storytelling work. Storytelling provides strong tools to establish this connection between people and the behavioural change that is necessary to break through the we vs them thinking. Storytelling is about sharing between two people, the teller and the listener on an equal base. A good story takes them journey along opposing and supporting forces. A journey containing personal, emotional and universal information. True and authentic information, often showing us the vulnerability of the teller. That is the base of the international training course we would like to set up, inviting youth workers from 6 countries to gain experience in working with storytelling to change behaviour and to fight polarization. We will introduce several methods and tools we developed over the years and enable the participants to experience using them. In addition to that we will work around themes like polarization, the construction of identity and the psychology of youth. The objective of the training is to provide youth workers and youth leaders from 6 countries with new tools to encourage youth to change behaviour in we vs them thinking and by that to fight polarization. This should lead to stronger, more respectful and more resilient communities all over Europes. As we use storytelling as a method, we would also like to familiarize more youth workers and youth leaders with the use of sharing stories in youth work. As we consider polarization one of the main threads for the European unity, we consider fighting polarization an important priority for European youth workers. In addition to that, we contribute to the development of youth work by introducing new methods and tools. Storytelling as a method might be known more and more in North-West Europe, but for the South of Europe, the Balkan and the Baltics it is really new and innovative. That is one of the main reasons to deliver this training in a transnational context, inviting specfic countries like Spain, North Macedonia, Cyprus and Estonia. The transnational character will also enable participnats to share experiences and to learn from each other.