Most workflow models view the applications as a fixed set of tasks.
In this paper we analyse inter-organisational application domains and analyse properties for transactional workflows and systems supporting them. We study a workflow model for the applications where job step instances cannot be fixed in advance. We analyse requirements arising from this kind of environments through a particular application, and introduce special modelling components to support these requirements. In Proc. of the 4th Intl. Doc 85 Specifying and enforcing intertask dependencies - Attie, Singh et al.