This volume contains the proceedings of the 21st International
Conference on Application and Theory of Petri Nets. The aim of the Petri
net conferences is to
createaforumfordiscussingprogressintheapplicationandtheoryofPetrinets.
Typically, the conferenceshave 100{150participants{ one third of these
coming from industry while the rest are from universities and research
institutions. The conferences always take place in the last week of
June. The conference and a number of other activities are co-ordinated
by a ste- ingcommittee withthe followingmembers: G.Balbo(Italy),
J.Billlington(A- tralia), G.De Michelis(Italy), C.Girault(France),
K.Jensen(Denmark), S.- magai (Japan), T. Murata (USA), C. A. Petri
(Germany; honorary member), W. Reisig (Germany), G. Roucairol (France),
G. Rozenberg (The Netherlands; chairman), and M. Silva (Spain).
Otheractivitiesbeforeandduringthe2000conferenceincludedtoolpresen- tions
and demonstrations, a meeting on \Interchange Formats", extensive int-
ductorytutorials, twoadvancedtutorialson\HardwareDesign"and\Timedand
Hybrid Automata", and two workshops on \Software Engineering" and \Pr-
tical Use of High-Level Nets". The tutorial notes and workshop
proceedings are not published in these proceedings, but copies are
available from the organisers. The 2000 conference was organised by the
CPN Group at the University of Aarhus, Denmark. We would like to thank
the organisers (see next page) and their teams.
WewouldliketothankverymuchallthosewhosubmittedpaperstothePetri net
conference.We receiveda totalof 57submissions from 20di erent countries.
This volume comprises the papers that were accepted for presentation.
Invited lectures were given by Jordi Cortadella, Philippe Darondeau,
Gregor Engels, Serge Haddad, Kim Guldstrand Larsen, and Ole Lehrmann
Madsen.
