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Professor Emeritus and former Rector of the Technical University of Crete, Yannis A. Phillis was an invited keynote speaker at the 15th International Conference on Logistics, Informatics and Service Sciences (LISS 2025), which took place at the Budapest University of Technology and Economics between August 1 and 5, 2025. 

His talk was entitled “On an aggregation theory for indicators expressing behaviors of complex systems with an application to sustainability” and was received enthusiastically. 

In it a novel axiomatic mathematical theory was presented for the synthesis of indicators regarding large technological or social systems which the speaker and Professor Vassilis Kouikoglou developed recently. Besides the synthesis, a method was shown for pinpointing those indicators with the highest influence in the behavior of the system to aid decision making. The theory was applied to the ranking of 161 countries according to their sustainability based on 68 indicators and about 100,000 data points. Scandinavian countries occupy the top of the list, while Greece is 29^th with indicators requiring immediate improvement being renewable energy, serious protection of remaining forests and increasing per capita income.