This volume is the scientific chronicle of the NATO Advanced Research Workshop on Computational Aspects of the Study of Biological Macro­ molecules by Nuclear Magnetic Resonance Spectroscopy, which was held June 3-8, 1990 at Il Ciocco, near Barga, Italy. The use of computers in the study of biological macromolecules by NMR spectroscopy is ubiquitous. The applications are diverse, including data col­ lection, reduction, and analysis. Furthermore, their use is rapidly evolv­ ing, driven by the development of new experimental methods in NMR and molecular biology and by phenomenal increases in computational perfor­ mance available at reasonable cost. Computers no longer merely facilitate, but are now absolutely