With the increased power and availability of computers, computer aided modeling is becoming more prevalent in various fields of engineering. One important example is modelling of stress, strain, and flow (plastic solid and liquid) at the continuum level. Examples of this are finite element analysis, finite difference analysis, Monte Carlo simulations, and the random walk. This book covers all of these topics and generally serves as a good introductory textbook to learn about modelling at the continuum scale. The mathematical treatment is very brisk though, and requires prior knowledge of linear and partial differential equations, linear algebra, and basic computing.