This volume is based on the proceedings of the 12th International Conference on Applications and Theory of Petri Nets, held in Gjern, Denmark in June 1991. It contains 18 selected and revised papers covering all aspects of recent Petri net research.

Replacement of open interface subnets and stable state transformation equivalence.- Bounded self-stabilizing Petri nets.- Generative families of positive invariants in Coloured nets sub-classes.- Autonomous and timed continuous Petri nets.- The Devnet: A Petri net for discrete event simulation.- A new technique for finding a generating family of siphons, traps and st-components. Application to colored Petri nets.- A concept of hierarchical Petri nets with building blocks.- Petri net tool overview 1992.- The minimal coverability graph for Petri nets.- Distributed implementation of CCS.- Saturation conditions for Stochastic Petri Nets.- Marking optimization in timed event graphs.- Parameterized reachability trees for Predicate/Transition nets.- Iterative decomposition and aggregation of Stochastic marked graph Petri nets.- Constraints and extensions in a Calculus of EN systems.- Comparability orders and measurement.- Deterministic systems of sequential processes: A class of structured Petri nets.- Compositional state space generation.

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