* How to Build an Action Functional * The Action Functional in Quantum Mechanics * The Feynman Path Integral in Field Theory * Purturbative Evaluation of the FPR: (to the power of 4) Theory * Path Integral Formulation with Fermions * Guage Symmetries: Yang-Mills and Gravity * Path Integral Formulation of Guage Theories * Perturbative Evaluation of Guage Theories