Abstract: On the one hand, Petri net models have a successful history in the modeling, simulation, and verification of workflows and business processes. On the other hand, BPEL is the de facto standard for describing and implementing Web service-based business processes. With abstract BPEL

to translate BPEL processes automatically into Petri nets. Using high-level Petri nets, data aspects can be fully incorporated while these aspects can as well be ignored by switching to low-level Petri nets

Abstract. This paper presents WorkflowNet2BPEL4WS a tool to automatically map a graphical workflow model expressed in terms of Workflow Nets (WF-nets) onto BPEL. The Business Process Execution Language for Web Services (BPEL) has emerged as the de-facto standard for implementing processes

. This model is represented in terms of a so-called Colored Workflow Net (CWN), which is a generalization of the classical workflow nets to CPN. In the second translation step, the CWN is translated into implementation code. The target implementation language is BPEL4WS deployed in the context of IBM Web

and company-level models the aggregate VC fund inflows in the year a sample fund was raised and the year a portfolio company completed a funding round, respectively. Controlling for the investment opportunities open to a VC is harder. Gompers and Lerner 21 VC funds take a number of years to invest

Hiermit versichere ich, die vorliegende Diplomarbeit selbstständig und unter ausschliesslicher Verwendung der angegebenen Quellen und Hilfsmittel angefertigt zu haben. Diese Arbeit hat in gleicher oder ähnlicher Form noch keiner Prüfungsbehörde vorgelegen. Darmstadt, 14. Februar 2006

Abstract. We study open nets as Petri net models of web services, with a link to the practically relevant language WS-BPEL. For those nets, we investigate the problem of serviceableness which we consider as fundamental as the successful notion of soundness for workflow nets, i.e. Petri net models

that achieve their QoS requirements through dynamically adapting to changes in the system state, environment, and workload. QoSMOS service-based systems translate high-level QoS requirements specified by their administrators into probabilistic temporal logic formulae, which are then formally and automatically

First, I would like to thank to Dimka Karastoyanova and Mariano Cilia for all the fruitful discussions, their guidance and support through the course of this project. Thanks also to Prof. Alejandro Buchmann who sponsored my stay at Technische Universität Darmstadt during the spring of 2004. The special thanks go to my advisor, Mariano Cilia, who has made all this possible. Finally, I’d like to thank to my family for all these years of support.

Abstract—Web service composition refers to the creation of new services by combining functionalities provided by existing ones. Current web service choreography proposals, such as WSCI, WS-CDL and BPEL, provide notations for describing the message flows in Web service collaborations. The kernel