"Use cases" describe particular episodes that are able to explain major processes and functions in a certain system. Use cases identify the major actors, the major functions of a system and the major goals, that these actors achieve through the functions of the system. The use cases provide a bases for the development of the scenarios. The fine grained use cases will converted into scenarios that describe key episodes. The unique advantage of the method is the triangulation of perspectives: The key episode that is described in the scenario will described for different stakeholders: this results in the identification of conflicts and contradictions within existing practices. The presentation will provide an inside into this methodology give an example how this methods has been adapted for the research of trainers and their activities