The International Society for Rock Mechanics will sponsor the Sixteenth Symposium on Rock Mechanics, to be held at the University of Minnesota, Minneapolis, September 22 to 24, 1975. Delegates from over 25 countries are expected to attend.Following the theme, ‘Design Methods in Rock Mechanics,’ it is intended to review current design methods and approaches to rock engineering problems such as rock foundations, rock slopes, mine layouts, ground movement and subsidence, support of tunnels and large excavations, and blasting rounds (surface and underground).