IJAHP: Topcu, Ozaydin/MCDM2019 special topics articles International Journal of the Analytic Hierarchy Process 2 Vol. 12 Issue 1 2020 ISSN 1936-6744 https://doi.org/10.13033/ijahp.v12i1.754 MCDM2019 Special Topics Articles After the 25th International Conference on Multiple-Criteria Decision Making (MCDM2019) in Istanbul, one of the most successful MCDM conferences to date, authors that presented their works there were invited to submit these studies to the special topics section of the International Journal of the Analytic Hierarchy Process. The conference attracted 261 participants from five continents and 39 countries, and encompassed a wide variety of topics. Among the sessions at the conference, 12 were in the AHP/ANP stream. In addition, three special sessions, two tutorials, one invited parallel session, and six contributed parallel sessions were all AHP/ANP related. The Creative Decisions Foundation (CDF) generously provided 21 grants to participants from 13 countries who had either recently received their PhDs or were PhD students who had prepared works on the AHP/ANP. The wide variety of topics is reflected in the papers selected for the IJAHP special topics section. These papers went through a set of reviews and three were selected for publication. The first study in this special issue is an application for soil erosion management, while the second is in the healthcare field, and the final one is an assessment of real-estate investments. In summary, these papers represent the outstanding work from MCDM2019, and we are certain they will constitute good AHP/ANP references for IJAHP readers. Ilker Topcu Professor Istanbul Technical University Department of Industrial Engineering ilker.topcu@itu.edu.tr Ozay Ozaydin Assistant Professor Dogus University Department of Industrial Engineering oozaydin@dogus.edu.tr