Preface
    NMR is the premier forum for results in the area of nonmonotonic reasoning. Its aim is to bring
together active researchers in this broad field within knowledge representation and reasoning (KRR),
including belief revision, uncertain reasoning, reasoning about actions, planning, logic programming,
preferences, deontic reasoning, argumentation, causality, and many other related topics including sys-
tems and applications.
    NMR has a long history - it started in 1984 and has been held every two years until 2020, and then
every year. Recent previous NMR workshops were held in Hanoi (virtually) (2021), Rhodes (virtually)
(2020), Tempe (2018), Cape Town (2016), Vienna (2014), Rome (2012), Toronto (2010), and Sydney
(2008).

    This volume contains the papers accepted for presentation at the 20th edition of the workshop,
held on August 7–9, 2022 in Haifa, as part of the Federated Logic Conference (FLoC 2022). There
were 20 submissions, each of which has been reviewed by three program committee members. The
committee has decided to accept 18 papers: 12 are presented as full papers and 6 as extended ab-
stracts. The program also includes three invited talks by Thomas Eiter (TU Wien), Pierre Marquis
(Univ. Artois, CNRS, CRIL / Institut Universitaire de France) and Serena Villata (CNRS - Labora-
toire d’Informatique, Signaux et Systèmes de Sophia-Antipolis).

   We thank the following sponsors of NMR’22 for their generous support:

   • Artificial Intelligence Journal
   • KR Inc. (Principles of Knowledge Representation and Reasoning)

   • GULP (Gruppo Ricercatori e Utenti Logic Programming)
   • EurAI (European Association for Artificial Intelligence)


                                                                NMR 2022 Program Chairs
                                                                Laura Giordano
                                                                Giovanni Casini

                                                                NMR 2022 Local Chair
                                                                Ofer Arieli

                                                        Alessandria, Pisa and Tel-Aviv, July 2022