The SLIMM (Surface Layer Integration Measurements and Modelling) experiment was set up to determine average flux densities of momentum, heat (sensible and latent) and carbon dioxide at the landscape scale (about 5 square kilometres). The study area was situated in the North of the Netherlands and consisted of three distinguishable areas within the scale of interest, namely a bog, a forest and an agricultural area. From January through November 1995 simultaneous flux measurements using profile and eddy correlation methods were performed in all areas, the VUA thereby covering the agricultural area. In addition to the tower measurements remote sensing techniques such as SODAR and 3D-RADAR/RASS have been used to probe the air flow at greater elevations. In order to obtain a better understanding of the processes in complex terrain also a 2D-mesoscale computer model has been developed. This computer model has been validated by comparison with observations of profiles and flux densities. Besides a general outline of the experiment, results from both the measurements and the model will be presented.