To illustrate the wide field of research conducted in the Stieltjes
Institute, in this chapter a research `highlight' from each of the four
main areas is presented.

For **Algebra and Geometry**, J.-H. Evertse, senior
researcher at the University of Leiden and member of the
programme `Number Theory' has contributed a paper on
`Diophantine Equations and Diophantine Approximation'.

For **Analysis**, A. Doelman, professor at the University of
Amsterdam and leader of the programme `Differential Equations,
Dynamical Systems and Numerical Analysis' discusses the topic
`Stabilization of pulses by diffusion'.

**Stochastics** is represented W.Th.F. den Hollander, leader
of the programme `Probability' and professor at the Eindhoven
University of Technology as well as scientific director of
EURANDOM, with a paper named `Fluctuations of the Wiener
Sausage'.

For **Operations Research** such a highlight is `The
Mathematics of Call Centers' by G. Koole, professor at the Free
University of Amsterdam and leader of the programme `Stochastic
Operations Research'.