Nowadays, many organizations form dynamic partnerships to deal effectively with market requirements. As companies use automated workflow systems to control their processes, a way of linking workflow processes in different organizations is useful in turning the co-operating companies into a seamless operating virtual enterprise. The CrossFlow Esprit project aims at developing information technology for advanced process support in dynamic virtual organizations with contract based service trading. Contracts are necessary for flexible service outsourcing. This report presents contracts as a way of finding suitable partners, connect WFMSs of different kinds, control outsourced workflow, and share an abstraction of the workflow specification between the partners. The contract defines the data, process, and conditions relevant to the co-operation and the outsourced workflow on an abstract level. This information can be fed through an interface to the WFMSs on both sides of the outsourcing in order to automate fully the co-operation between the partners.
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