Progress towards a better understanding of groundwater circulation and transport processes in aquifers demands a multidisciplinary approach to a host of unresolved problems. Although much progress has been made within recent years in interpreting the dynamic character of groundwater systems, many key issues remain to be addressed. In particular, several areas demand attention: the role of sedimentological information (heterogeneity) in groundwater and transport models, the scaling-up of observations from outcrop scale to larger scales and the integration of geological and geophysical information of different quality into the description of an aquifer structure. Still nowadays many of the heterogeneities cannot be recognized directly because of the limitation of measurement techniques. This is probably one of the reasons for the limited application of aquifer-sedimentology and geophysics in practical cases. In order to consolidate, expand, and make a larger number of people aware of the contribution of modern aquifer-sedimentology, including modelling and ultra-high resolution geophysical methods, several lines of intervention were identified: (1) a better collaboration of the different disciplines on site-specific applied problems; (2) development of new modelling techniques combining data of different quality; (3) development of optimizing tools (position and number of wells, additional geophysical methods, baysian techniques); (4) development of a 'common language' among sedimentologists and hydrogeologists to overcome communication problems.