The Lund model, inspired by quantum chromodynamics, has provided a very promising approach to the dynamics of quark and gluon interactions. Starting with a brief reprise of basic concepts in relativity, quantum mechanics of fields and particle physics, Dr. Andersson discusses the dynamics of the massless relativistic string, confinement, causality and relativistic covariance, Lund fragmentation processes, QED and QCD Bremsstrahlung, multiplicities, and particle-parton distributions. Throughout the book, theory confronts current experimental data, and considers implications for future experiments. The book also explores the relationships between the Lund model and other models based on field theory (the Schwinger model, S-matrix models, light-cone algebra physics, and variations of the parton model) and models based on statistical mechanics (the Feynman-Wilson gas, scaling, iterative cascade models). This is a unique monograph for those working in theoretical and particle physics.