Making decisions in complex contexts is indeed a very challenging endeavour. In many circumstances that is the case of making decision in the scope of Environmental Remediation when technical, economical, regulatory (safety) and social dimensions need to be all considered. Multi-Decision Criteria Analysis (MCDA) appears to be one methodology that can contribute to this process. Therefore, the objective of this webinar is to review the basics of MCDA, introduce a tool developed by the Karlsruhe Institute of Technology, Germany and demonstrate its application in a semi-real case giving the opportunity to extensive interaction with the audience.IAEA Network of Environmental Management and Remediation –?ENVIRONET