Lunteren (January 11 - 14, 2000).

There were three minicourses, each course consisted of three lectures:
D. Karger (MIT, Cambridge, USA): Randomized algorithms for cut and flow problems.
S. M. Ross (University of California, Berkely, USA): Some non-stochastic applications of
probability.
S. Sen (University of Arizona, Tucson, USA): Stochastic programming: applications, properties,
and computational challenges.
The other invited lectures were given by:
R.J. Vanderbei (Princeton University, Princeton, USA): (1) Interior-point methods for nonlinear
programming; (2) Interior point methods for second-order cone programming and semi-definite
programming.
R.R. Weber (University of Cambridge, Cambridge, UK): Pricing communications services I & II.
Laurence Wolsey (CORE, Louvain-la-Neuve, Belgium): (1) Cutting planes for integer and mixed
integer programming; (2) Modelling practical lot-sizing problems as mixed integer programs.
Fifteen PhD presentations were given.
In cooperation with the NGB, a seminar on Quantitative Financial Risk Management was organized, with as speakers: Boender (ORTEC & Erasmus University & Free University), Frijns (ABP & Free University), Kocken (Rabobank), Ronner (Philips Electronics & Free University), Sijbrand (ABN AMRO) and Vorst (ErasmusUniversity).
On the occasion of the 25^th conference, there was a special session with five-minutes presentations of Dutch OR-researchers. Furthermore, the second Gijs de Leve Prize was presented by de Leve to J. Sturm for the best OR-thesis during the years 1997 - 1999.