This book caters to the needs of the students of undergraduate and postgraduate courses, through effective formulation of mathematical models. This comprehensive text introduces readers to the theory and applications of finite difference technique to arrive at optimal solutions. The neat free-body diagrams are presented and problems are solved systematically to make the procedure clear. It offers finite difference techniques which include Crank-Nicolson implicit finite difference scheme. Each of five chapters includes thorough grounding in the related concepts. In addition, the results and discussions designed to aid further understanding of the subject.