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Modular process nets are a graphical and formal notation for the representation of technical and business process models containing concurrent activities. Originally this class of Petri nets was developed for the modeling, analysis, simulation and control of workflows and computer-based process control systems, but it is also suitable for use in all other areas where a formal but comprehensible description of complex processes is needed. After a description of the basic aims and design decisions for modular process nets, the report gives a brief introduction to low-level Petri nets including different types of transition rules and aspects of the descriptive and prescriptive use of process models. The main and most innovative points which are explained in more detail are the introduction of a hierarchical module concept for nets and the definition of elementare process nets. The module concept is part of a more general ("object-based") approach to Petri nets allowing severaltypes of ab straction, whereas the main points of elementary process nets are synchronous and asynchronous communication between separately interpreted net instances via events and token passing. Modular process nets are low-level Petri nets equipped with these module and communication concepts and optionally enhanced by die use of a task concept, a method known from the areas of computer-supported cooperative work (CSCW) and work-flow management. Because the report is aimed at a systematic and easy-to-understand introduction to modular process nets, it provides a precise explanation of this net class which is kept as informal as possible and enhanced by some typical application examples
Innovationsaktivitäten von Unternehmen wie auch Literatur zum Thema Innovation stellen bisher meist auf Produktinnovationen ab. Diese sind zweifellos wichtig. Dennoch wird zunehmend auf die Bedeutung von leistungsfähigen Prozessen in Unternehmen verwiesen, da diese oft ein nachhaltigeres wettbewerbliches Differenzierungspotenzial als Produktneuerungen besitzen. Dabei stellt sich die Frage: Wie können überlegene Prozesse hervorgebracht und installiert werden? Die Beantwortung dieser Frage versuchen Konzepte der Prozessinnovation aus dem Innovationsmanagement einerseits sowie das Prozessmanagement andererseits. Der Beitrag beleuchtet, in welcher Hinsicht sich beide Konzepte unterscheiden, wo Koppelstellen bestehen und in welchen Bereichen gar eine Verschmelzung vielversprechend erscheint. -
An innovative net-based methodology to integrate qualitative and quantitative analysis of distributed software systems is outlined, and an on-going prototype implementation of a related graphic-oriented tool kit is sketched. The proposed method combines qualitative analysis, monitoring and testing as well as quantitative analysis on the basis of a net-based intermediate representation of the distributed software system under consideration. All transformations (from the distributed software system into a first Petri net model, and between the different kinds of net models) can be made formally, and therefore automated to a high degree. The evaluation of quantitative properties is based on so-called object nets which are obtained by a property-preserving structural compression and quantitative expansion of the qualitative model. In this way, the frequency and delay attributes necessary to generate quantitative models are provided by the monitoring and testing component.