Thermodynamics of Nucleation: First-Order Phase Transitions; Driving Force for Nucleation; Work for Cluster Formation; Nucleus Size and Nucleation Work; Nucleation Theorem; Properties of Clusters; Equilibrium Cluster Size Distribution; Density-Functional Approach. Kinetics of Nucleation: Master Equation; Transition Frequencies; Nucleation Rate; Equilibrium; Stationary Nucleation; First Application of the Nucleation Theorem; Nonstationary Nucleation; Second Application of the Nucleation Theorem; Nucleation at Variable Supersaturation. Factors affecting Nucleation: Seed size; Line Energy; Strain Energy; Electric Field; Carrier-Gas Pressure; Solution Pressure; Preexisting Clusters; Active Centres. Applications: Overall Crystallization; Crystal Growth; Third Application of the Nucleation Theorem; Induction Time; Fourth Application of the Nucleation Theorem; Metastabiltiy Limit; Maximum Number of Supernuclei; Size Distribution of Supernuclei; Growth of Thin Films; Lifetime of Amphiphile Bilayers. Appendices; References; Author index; Subject Index.