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The application of Multi-Criteria Evaluation in combination with Geographical Information Systems in handling problems related to the environment and to spatial distribution of variables is presented through three case studies. The first one deals with the application of Boolean evaluation in siting natural wastewater treatment facilities, the second one applies both exclusionary and non-exclusionary criteria in siting a Municipal Solid Waste landfill, while the third one computes groundwater vulnerability to pollution applying non-exclusionary criteria coupled with weighted linear combination and ordered weighted averaging. Concluding, the present work highlights the advantages and the limitations of those applications in problems of siting human activities, urban development, resource allocation and management. [ABSTRACT FROM AUTHOR]