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WinGeol/SedTec is a software package which simulates erosion and deposition in dependency of topography, fault movements, lithological properties and sea level. Sediment transport such as mass and suspension flows are induced by elevation or concentration differences between neighbouring cells. Grain size reduction during sediment transport is included into the model. The spatial distribution of different rock types in the source area is used to model sediment composition. Rock types are characterized by their resistance to erosion and grain size reduction during sediment transport. Input data for simulation include elevation, lithology, fault data and tabular data from various data sets such as sea level curves and control points. Faults are defined by their geometry, geographic position, time interval of activity, and a displacement vector. Examples simulated with WinGeol/SedTec include landscape deformations due to translation and rotations of several fault blocks, erosion and deposition along a steep scarp and sediment transport and grain size distributions in sedimentary basins such as the Pleistocene Mitterndorf basin in Austria. Das Softwarepaket WinGeol/SedTec simuliert Erosion und Sedimentation in Abhängigkeit von Topographie, Störungsbewegungen, Lithologie und Meeresspiegel. Sedimenttransport wie etwa Massenströme und Suspensionsströme werden dabei durch Höhen- oder Konzentrationsunterschiede zwischen benachbarten Zellen ausgelöst. Die Reduktion von Korngrößen während des Transports wird genauso berücksichtigt wie die räumliche Verteilung verschiedener Gesteinstypen im Abtragungsgebiet, die wesentlich die Sedimentzusammensetzung beeinflussen. Die verschiedenen Gesteinstypen sind im Wesentlichen durch ihre Widerstandsfähigkei