These 25 revised papers presented together with 6 invited contributions were reviewed and selected from 77 submissions. Issues on research and development in the area of Petri nets are addressed, in particular concurrent systems design and analysis, model checking and networking.

Invited Papers.- Coloured Petri Nets: Status and Outlook.- Towards Biopathway Modeling and Simulation.- The Resource Allocation Problem in Flexible Manufacturing Systems.- Colored GSPN Models for the QoS Design of Internet Subnets.- Compositional Theories of Qualitative and Quantitative Behaviour.- Net Models Supporting Human and Humane Behaviors.- Full Papers.- Deciding Life-Cycle Inheritance on Petri Nets.- Nets Enriched over Closed Monoidal Structures.- Automatic Symmetry Detection in Well-Formed Nets.- A Proposal for Structuring Petri Net-Based Agent Interaction Protocols.- Modelling Mobility and Mobile Agents Using Nets within Nets.- Modular System Development with Pullbacks.- Specification and Validation of the SACI-1 On-Board Computer Using Timed-CSP-Z and Petri Nets.- On the Use of Petri Nets for the Computation of Completion Time Distribution for Short TCP Transfers.- Model Checking Safety Properties in Modular High-Level Nets.- On Reachability in Autonomous Continuous Petri Net Systems.- On the Siphon-Based Characterization of Liveness in Sequential Resource Allocation Systems.- Coloured Petri Nets in Development of a Pervasive Health Care System.- Logical Reasoning and Petri Nets.- Reactive Petri Nets for Workflow Modeling.- Distributed Diagnosis of Discrete-Event Systems Using Petri Nets.- Soundness and Separability of Workflow Nets in the Stepwise Refinement Approach.- On Synchronicity and Concurrency in Petri Nets.- Analysing Properties of the Resource Reservation Protocol.- Hierarchical Timed High Level Nets and Their Branching Processes.- A Heuristic Algorithm FSDC Based on Avoidance of Deadlock Components in Finding Legal Firing Sequences of Petri Nets.- Tool Papers.- PLC Programming with Signal Interpreted Petri Nets.- CPN Tools for Editing, Simulating, and Analysing Coloured Petri Nets.- The Model-Checking Kit.- Prototyping Object Oriented Specifications.- PNML Paper.- The Petri Net Markup Language: Concepts, Technology, and Tools.