Activities:The activities are being built based on the difficulty level and the scientific field.The low level activities aim to familiarize the learners with SL and the tools giving them small tasks and activities that focus to a steadily increasing engagement. The beginner level learners are always accompanied by SL experts. In the intermediate level, the collaboration with other participants is being included in the activities and it targets to the visit, observation and exploration of the SL learning venues and events (museums, planetariums, virtual laboratories, etc.). The advanced level includes creation, exchange and manipulation of objects and discussion on their tests and predictions. The medium and advanced level require the presence of a field expert, such as the scenario instructor, the virtual laboratory creator, etc. The expert level requires participants to set up their own questions and use a list of suggested tools and resources to conduct their own investigation. An expert can then become a member of the scaffolding team.