This volume focuses on the cooperative binding aspects of energetics in biological macromolecules. Methodologies such as NMR, small-angle scattering techniques for analysis, calorimetric analysis, fluorescence quenching, and time resolved FRET measurements are discussed. *Methods for Evaluating Cooperativity in a Dimeric Hemoglobin *Multiple-Binding of Ligands to a Linear Biopolymer *Fluorescence Quenching Methods to Study Protein-Nucleic Acid Interactions *Linked Equilibria in Biotin Repressor Function: Thermodynamic, Structural and Kinetic Analysis