Geostatistics has become an important methodology in environmental, c1imatological and ecological studies. So a new chapter demonstrating in a simple manner the ap plication of cokriging to conductivity, salinity and chlorophyll measurements as well as numerical model output has been incorporated. Otherwise some recent material on collocated cokriging has been added, leading to aseparate chapter on this topic. Time was too short to inc1ude further results at the interface between geostatistics and data assimilation, which is a promising area of future developments (see reference 27]). The...