Rainfall Simulation, Runoff and Soil Erosion may be an illustration of presentday efforts made by geomorphologists to promote soil erosion studies be refined methods and new conceptual approaches. The reader will find in Rainfall Simulation, Runoff and Soil Erosion an important contribution to the knowledge of active soil erosion, especially in typical sites in the Mediterranean belt, where soil degradation is very acute. Another set of papers enlightens the important role of laboratory research in the fundamental parametric investigation of processes, i.e. erosion by rain.