A characteristic of the soil system contributing to the generation of a soil function. One attribute can contribute to more soil functions. Attributes can be quantified with indicators A concrete aspect of the system (in the case of the LANDMARK project: plausibly linked to a soil function) for which indicators can be envisaged. Soil pH, NO3-transport to groundwater, NH3-release, water infiltration rate, soil respiration, crop management, pedo-climatic zone, and land use are examples of attributes which are relevant for the LANDMARK project.