An introduction to underlying principles and experimental procedures using the newest strategies and techniques for obtaining extensive NMR assignments in biopolymers based on NMR data and the primary structure. Includes an extensive and non-mathematical discussion of 2D NMR and Nulcear Overhauser effects; resonance assignments and structure determination in proteins; and resonance assignments and structure determination in nucleic acids. Enables specialists and non-specialists to evaluate the potentialities and limitations of the method.