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<pre>
        Preface by the PNSE’2021 Organisers



These are the proceedings of the International Workshop on Petri Nets
and Software Engineering (PNSE’2021) to be held at June 25, 2021. The
workshop is co-located with 42nd International Conference on Applica-
tion and Theory of Petri Nets and Concurrency (PETRI NETS 2021) in
Paris, France.
    The workshop emphasizes on the impact of software engineering in
general and its development based on Petri nets. Therefore we have espe-
cially invited contributions that work on subjects that could be relevant
for Petri nets, their application, supporting tools, etc. Results on other
formalisms or semi-formal techniques are highly welcome. More informa-
tion about the workshop can be found at: http://www.pnse.de/
    The previous edition of PNSE in 2020 should also have been in Paris,
but due to the pandemic it has to be be organised as a virtual meeting.
By the time this workshop was organised we all hoped that it would be
possible to meet in Paris again. We were too optimistic.
    Overall we received 20 contributions for these proceedings. Each paper
was reviewed by at least three referees. During the reviewing process the
program comittee selected 13 contributions for publication.
    We are glad that Joel Greenyer accepted our invitation to give an
inivted talk about Scenario-Based Modeling and Programming of Dis-
tributed Systems.
    The international program committee of PNSE’21 was supported by
the valued work of Artur Meski, Teofil Sidoruk, Mitchell Klijs, Malte
Heithoff, and Joel Charles as additional reviewers. Their valuable work is
highly appreciated.
    Furthermore, we would like to thank our colleagues in the PC and the
local organization team for their support – we are all now ‘experts’ in the
organisation of virtual events.

June 2021                                         Michael Köhler-Bußmeier
                                                           Ekkart Kindler
                                                               Heiko Rölke



  Copyright © 2021 for this paper by its authors. Use permitted under Creative
  Commons License Attribution 4.0 International (CC BY 4.0).
The PNSE’2021 Programme Committee

Robin Bergenthum
José Manuel Colom
Elena Gómez-Martı́nez
Serge Haddad
Ekkart Kindler (co-chair)
Michael Köhler-Bußmeier (co-chair)
Maciej Koutny
Lars Kristensen
Jan Mendling
Daniel Moldt
Wojciech Penczek
Laure Petrucci
Alfonso Pierantonio
Pascal Poizat
Heiko Rölke (co-chair)
Bernhard Rumpe
Yann Thierry-Mieg
Jan Martijn van der Werf
Eric Verbeek
Manuel Wimmer

</pre>