This is a collection of papers presented and discussed at the first EBSA workshop held at Saltsj6baden outside stockholm in Sweden, July 6-10, 1986. The common theme of these papers is dynamics of biomolecules, and how the dynamics depends on the molecular structure and organi zation, and connects to and determines the biological function. This is a rapidly expanding field of research which combines many different aspects of molecular bio physics. Much material is new and presented for the first time. Even if the work so far has been of the kind that is usually called basic research, practical applications are clearly indicated in some articles, and are waiting around the corner in several other cases. At the workshop only one third of the time was used for the formal presentations and two thirds for discussion. To this should also be added discussions during the poster sessions. During these lively and unrecorded discussions fresh viewpoints emerged and new ideas were created. Ad mittedly, our knowledge at present is only fragmentary but when pieces of the puzzle are brought together at a workshop or in a publication of this kind more extended and sometimes unexpected contours and shapes become vi sible. It is our hope that this rapid publication of camera-ready manuscripts will transfer some of the spi rit at the workshop to the reader, and in his or her institute or laboratory initiate further discussions, bring forward more ideas and start new experimental ap roaches.