The MULBO (Multi-criteria Landscape Assessment and Optimisation) framework has been specifically developed to help guide these complex multiple objective decisions. In this current project MULBO has been trialled in the Lake Tyrrell Basin of Northern Victoria, Australia. Lake Tyrrell is situated within the Mallee region and covers an area of around 400,000 hectares. The Mallee is a semi-arid region which supports broad-scale cropping on sandy low nutrient soils, where traditional agriculture has had a high impact on native fauna and flora, and where naturally saline groundwater and wind erosion present significant threats to both agricultural production and biodiversity. The MULBO process includes the following steps (a) goal determination across multiple management criteria, (b) function analysis on the basis of GIS, (c) function assessment, (d) scenario formulation and (e) land use compromise optimisation to calculate land use scenarios . In this project, major land management goals within the Mallee were identified on the basis of regional and local management objectives and input from regional land managers, representatives from community environmental programs and farmers. Major landscape health problems in the region were identified, as were the major management objectives to be optimized. These objectives included indicators for (a) farm income, (b) salinity risks, (b) wind erosion and (d) habitat connectivity.