Information Systems & Grid Technologies
  Thirteenth International Conference ISGT’2020

           ONLINE, May 29 – 30, 2020
ISGT’2020 Conference Committees
Chair
        Prof. Vladimir DIMITROV

Program Committee
   •    Míchéal Mac an AIRCHINNIGH, Trinity College,
        University of Dublin
   •    Pavel AZALOV, Pennsylvania State University
   •    Marco DE MARCO, Catholic University of Milan
   •    Milena DOBREVA, University of Malta
   •    Vladimir GETOV, University of Westminster
   •    Seifedine KADRY, American University of the Middle
        East, Kuwait
   •    Kalinka KALOYANOVA, University of Sofia “St. Kliment
        Ohridski”
   •    Angelika KOKKINAKI, University of Nicosia
   •    Violeta MANEVSKA, University of Bitola “St. Kliment
        Ohridski”
   •    Maria NISHEVA, University of Sofia “St. Kliment
        Ohridski”
   •    Dov TE’ENI, Tel-Aviv University
   •    Stanislaw WRYCZA, University of Gdansk
   •    Fani ZLATAROVA, Elizabethtown College

Organizing Committee
   •    Vasil GEORGIEV
   •    Maria KOLEVA
Information Systems &
       Grid Technologies
Thirteenth International Conference ISGT’2020
                ONLINE, May 29 – 30, 2020

                       Proceedings

organized by:

   •   Faculty on Mathematics and Informatics, University
       of Sofia “St. Kliment Ohridski”
   •   Bulgarian Chapter of the Association for Information
       Systems (BulAIS)
Preface

This conference was being held for the thirteenth time on
29–30 May 2020 online for the first time because of the
COVID-19 pandemic. It is supported by the Science Fund of
the University of Sofia “St. Kliment Ohridski” and by the
Bulgarian Chapter of the Association for Information Systems
(BulAIS).

Total number of papers submitted for participation in
ISGT’2020 was 31. They undergo the due selection and
revision by at least two members of the Program Committee.

This Proceeding comprise 24 papers of 36 Bulgarian and 15
foreign authors (coauthors).

The conference papers are available on the CEUR Workshop
Proceedings (http://ceur-ws.org/) and on the ISGT web page
http://isgt.fmi.uni-sofia.bg/ (under “Previous conferences”
tab).

Responsibility for the accuracy of all statements in each peer-
reviewed paper rests solely with the author(s). Permission is
granted to photocopy or refer to any part of this book for
personal or academic use providing credit is given to the
conference and to the authors.

                                                   The editors