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Web services composition techniques provide a practical foundation for business process management in loosely coupled distributed environments. Requirements analysis, however, is still the essential step for launching any commercial systems. Nevertheless, what is needed from the business world and what is available from the IT world remain indistinguishable, that obstructs the way to achieve smooth business collaboration. In order to bridge this gap, a scenario-based Petri Net approach for collaborative business process modelling is proposed. 33 scenarios from 6 projects in recent 10 years are analysed and Petri Nets methodology is used to model the elements in collaborative business process. Finally the requirements are identified from both collaboration levels and abstraction levels based on these scenarios.