Multicriteria Assessments encompass a family of decision-making approaches used to evaluate problems with different alternatives, expectations and wants, in order to find the most ‘suitable’ solutions. MCAs deal with complex and unstructured problems invoved in decision making, mainly in the sphere of socio-environmental management and involving a number of conflicting ecological, social, political and economic objectives, multiple interests groups, and different languages of valuation. How can NGOs and community action groups use these methods to build their cases for justice?