We propose a layered architecture for choreographies and orchestrations of web services. The proposed architecture uses the concept of process views. The distributed nature of the model and the concept of views improve the privacy of business partners but do not limit their interaction capabilities, an essential feature in B2B and inter-organisational applications. Our approach enables description of business processes in different levels of detail with a uniform modelling language and is fully distributed. several peer-reviewed research articles including book, journal articles and conference and workshop proceedings. He has served as a member of programme committee of different international conferences and workshops and reviewer of international journals.Johann Eder is a Full Professor for Information and Communication Systems at the University of Klagenfurt, Austria. Since 2005, he is the Vice President of the Austrian Science Funds (FWF), heading the Department of Natural Sciences and Technology. He successfully directed several funded research projects, e.g., in the fields of workflow management systems, temporal data warehousing, interoperability, information systems for biobanks, self-healing 94 A. Tahamtan and J. Eder web services. He co-authored one book, edited 21 books/proceedings/special issues of journals and published more than 140 peer reviewed papers. He served as the Chair and a member in numerous programme committees for international conferences and as a Referee or Editorial Board Member for international journals. He held positions at the Universities of Vienna and Klagenfurt and visiting positions at the University of Hamburg and with AT&T Research.