Leonardo Salvatore Alaimo is Research Fellow of Social Statistics (SECS-S/05) at the Department of Social Sciences and Economics of the University of Rome La Sapienza. He holds a Ph.D. in Social Statistics at the University of Rome La Sapienza in 2020. He took part in many international conferences and he is the author of several papers published in a wide range of international peer-reviewed journals. His research interests are mainly the measurement of complex phenomena, the synthesis of systems of statistical indicators, multi-level models, composite indicators, the multivariate statistical methods, sustainability, quality of life, and well-being.