Human user interactions are currently not covered by the Web Services Business Processes Execution Language (WS-BPEL), which is primarily designed to support automated business processes based on Web services. In practice, however, many business process scenarios require user interaction. This paper describes scenarios where users are involved in business processes, and defines appropriate extensions to WS-BPEL to address these. Copyright Notice © Copyright SAP AG and International Business Machines Corp 2005. All rights reserved. No part of this document may be reproduced or transmitted in any form without written permission from SAP AG (“SAP”) and International Business Machines Corporation (“IBM”). This is a preliminary document and may be changed substantially over time. The information contained in this document represents the current view of IBM and SAP on the issues discussed as of the date of publication and should not be interpreted to be a commitment on the part of IBM and SAP. All data as well as any statements