The authors describe the results of 12 years of mowing and grazing management carried out on some chalk grassland reserves on the Belgian part of the ‘St-Pietersberg', which is situated south of the Dutch town of Maastricht. The effects of the different management regimes were investigated by means of permanent plots which were recorded each year. On the ‘Thier de Lanaye’ grassland, mowing and removing the litter in September proved to be a good management regime. It resulted in a higher number of species per plot than mowing without removing the litter, abandoning or burning this grassland area.