This book focuses on a selection of analytical methods enabling the investigation of solution complexation equilibria, providing information on the speciation (stoichiometry and in some instances structure of the formed species) but also allowing the measurement of thermodynamic parameters (equilibrium constants, reaction enthalpy and entropy). The seven chapters, authored by eminent practitioners in their field, cover both the theoretical and the practical aspects with helpful experimental guidelines. The latest technical and computational advances are described in a way that unambiguously show the major contributions of the authors at the top of their field. Hence, this book is intended to be a valuable introduction to newcomers, while being at the same time a helpful companion to more experienced users of each instrumental techniques. It provides an up-to-date overview with useful tips and hints on the application of selected cutting-edge analytical methods that allow unravelling and modelling intricate complex formation equilibria. So far there has been no such book focussing specifically on the measurement of thermodynamic parameters, while covering such a wide panel of techniques. This book will be of interest to a broad readership, including analytical, coordination, supramolecular, environmental, instrumental, and physical chemists, radiochemists, electrochemists, and biochemists among others.