Blue, black, double black diamond or S4? Moderate, advanced or Pro Line? And what exactly makes a trail blue, red or black? Trail difficulty rating systems come in all shapes and sizes and are far from homogenous. But they do serve a purpose.
Since October 2020, Dave Spielmann is IMBA Schweiz new director. Dave succeeds Martin Wyttenbach who did the preparatory work getting IMBA Schweiz started and now returns to the Zurich University of Applied Science to be in charge of the environmental engineering research group.