The socioeconomic model currently supported by LUCAS is the land-cover model developed by Wear et al. ([WTF94]). In this model, the dependent variable is land cover. The LUCAS Setup Menu displays two choices for the dependent variable: land cover and land use. The land-use dependent variable is greyed-out, indicating that it is not currently supported. The land-use dependent variable choice is inactive since the underlying land-use change socioeconomic model has yet to be integrated into the LUCAS environment. To indicate that the land-use option is not currently supported by LUCAS, the XmNsensitive resource of the Motif XmToggleButton widget is set to FALSE so that this option appears grey on the user interface.