Supersymmetric gauge field theory and string theory Chapter 1 Supersymmetry Algebra and Multiplets chapter 2 Lagrangians for Chiral Superfields chapter 3 Lagrangians for Vector Superfields chapter 4 Pure Supergravity chapter 5 Coupling of Supergravity to Matter chapter 6 Supergravity Grand Unified Theories chapter 7 The Bosonic String chapter 8 The Superstring chapter 9 The Heterotic String chapter 10 Compactification of the Ten Dimensional Heterotic String to Four Dimensions chapter 11 Direct Construction of Four Dimensional Heterotic String Theories chapter 12 Superstring Interactions.