Allel HADJALI is Full Professor in Computer Science at the National Engineering School for Mechanics and Aerotechnics (ISAE-ENSMA), Poitiers, France. He has been an Associate Professor in Computer Science both in University of Rennes 1 (France) and University of Tizi-ouzou (Algeria). He is a member of the Data & Model Engineering research team of the Laboratory of Computer Science and Automatic Control for Systems (LIAS/ISEA-ENSMA). His main area of research falls within Data Science field, and more specifically, the research topics related to Data Exploitation & Analysis, Knowledge Extraction and Recommendation. His current research interests include Computational Intelligence in Databases, Data Uncertainty, Cooperative/Intelligent Databases, Recommendation Systems, Web Services, Qualitative and Uncertain Reasoning with applications to Artificial Intelligence and Information Systems. His recent works were published in well-known journals (e.g., Applied Soft Computing, Knowledge and Information Systems, Fuzzy Sets and Systems, International Journal of Intelligent Systems, Journal of Intelligent Information Systems and Annals of Mathematics and Artificial). He also published several papers in International Conferences (ESWC, ICTAI, Fuzz-IEEE, FQAS, SUM, ISMIS, IPMU, CoopIS, IFSA, ACM SAC, ICWS, SCC, ER, VLDB and EDBT (demo papers)). He co-organized several special sessions on "Advances in Soft Computing Applied to Databases and Information Systems" in conjunction with EUSFLAT (2009 and 2011) Conference, “Advances in Bipolarity in Databases†in conjunction with EUSFLAT (2013), “Advances in Data Management in the Context of Incomplete Databases†in conjunction with IFSA (2015) Conference. He co-organized also several special issues in well-known journals, among them, "Flexible Queries in Information Systems" in Journal of Intelligent Information Systems (2009) and "On Advances in Soft Computing Applied to Databases and Information Systems" in Fuzzy Sets and Systems Journal (2011).