Scenarios that describe concrete situations of software operation play an important role in software development and especially in requirements engineering. Scenario details should vary in content when described from different viewpoints, but this presents a difficulty, because an informal scenario from one viewpoint can not easily be transformed into a scenario from another viewpoint with consistency and assurance. The authors have developed a language for describing scenarios in which simple action traces are embellished to include typed frames based on a simple case grammar of actions. This paper describes a transformation method to accomplish the transformation between scenarios from different viewpoints. An empirical investigation demonstrated the usefulness of the method by means of two experiments.