We have used variants of this scenario and activities many times in different countries in Europe. There is a hierarchy of difficulty: apprentices will find it relatively simple to understand the ideas behind Personal Learning Environments and to develop, share and explain their PLE diagrams. More difficult is the idea and practice of Personal Knowledge Management while Scholarly Ontolgies are another step up in terms of understanding and practice.
However, we have also found the activities presented here are flexible in terms of working with learners: we have presented this as a short workshop activity in conferences to a much more in depth (and longer) activity as part of courses. The activities are also flexible in terms of teaching and learning mode: face to face, online or blended.