This comprehensive textbook covers almost three different subjects, vi. Approximate methods in structural mechanics, the finite element method and the boundary element method. The text presented in question and answer form includes solved problems and a number of supplementary problems for the students to practice. The boundary element method is dealt with for the first time in the form of questions and answers for the students to learn the dubject without any difficulty. The main topics covered are: Approximate methods in structural mechanics Finite element method Boundary element method