Series Editor's Preface. Preface. A. Kaleidoscopic Excursion into numerical Calculations of Differential Equations; E. van Groesen. An Introduction to the Finite Element Method; J. van Kan. Coupling of Sound and Structural Vibrations; C. Kauffmann. Mathematical Modeling and Dimensional Analysis; J. Molenaar. About Difference Equations, Algebras and Discrete Events; G.J. Olsder. Acoustical Detection of Obstructions in a Pipe with a Temperature Gradient; S.W. Rienstra. Interior Point Approach to linear Programming: Theory, Algorithms and Parametric Analysis; C. Roos. Some Reflections on Newton's Method; F. Twilt. Recurrence and Induction in Computer Science; A.J. van Zanten.