Mainstreaming is one of the most important objectives resulting from building and running a European project. It is a mean to disseminate its successful results and to encourage their transferability to other organisations or  stakeholders working in sustainable tourism, and to influence and improve current policies and practices. An efficient mainstreaming could result in a change of behaviours or practices of the stakeholders in the way they deliver their products and tourists in their habits. By influencing policies and transferring successful practices, mainstreaming enables new innovative tools and practices to be  developed for long lasting results.