Richard D. Woods is Professor and Chair of Civil and Environmental Engineering at the University of Michigan, USA. His research interests have centred on foundation dynamics including piles, vibration measurements, blasting and other vibration damage, soil properties, and applications of geophysics in geotechnical engineering. . V.M. Sharma worked from 1990 to 1995 asDirector of the Central Soils and Materials Research Station, attached to the Ministry of Water Resources in India. His major contributions relate to in situ rock testing and study of rock-structure interaction problems. Dr. Sharma has been the President of Indian Geotechnical Society, and is a fellow of the Indian National Academy of Engineering