This book introduces the reader to the kinetic analysis of a wide range of biological processes at the molecular level. It shows that the same approach can be used to resolve the number of steps for a wide range of systems including enzyme reactions, muscle contraction, visual perception, and ligand binding. The author discusses the methods for characterizing these steps in chemical terms. Firmly rooted in theory, a wide range of examples and experimental techniques are introduced as well. A historical approach is used to demonstrate the development of the theory and experimental techniques of kinetic analysis in biology.