The ToPNoC Journal publishes papers from all areas of Petri Nets and Other Models of Concurrency, ranging from theoretical work to tool support and industrial applications. The volumes in ToPNoC are LNCS volumes, and, simultaneously, they form a Journal with its own Editorial Board. ToPNoC contains: - Revised versions of some of the best papers from workshops and tutorials at the annual Petri net conferences - Special sections/issues within particular subareas (similar to those published in the Advances in Petri Nets series) - Other papers invited for publication in ToPNoC - Papers submitted directly to ToPNoC by their authors This is the first volume of ToPNoC. It contains revised and extended versions of some of the best papers from the workshops at the 28th International Conference on Applications and Theory of Petri Nets and Other Models of Concurrency, which took place in Siedlce, Poland, June 25-29, 2007. The material has been selected and evaluated by the two Workshop and Tutorial Chairs, Wil van der Aalst and Jonathan Billington, in close cooperation with the chairs of the individual workshops. The 13 papers in this volume cover a wide range of Petri-net-related topics.The analysis techniques proposed range from process mining and performance analysis to verification and model-checking. The intended application domains range from the design of hardware systems to business process management. Therefore, this volume gives a good overview of the state of the art in Petri-net research.