Biddle et al, in their paper "Role-play and Use Case for Requirements Review", presents a technique that uses role-play and index cards to review use cases and to assists in making use case development more accessible and better guided. The technique is based on the established CRC card technique.
The basic idea was to use index cards for use case, and to somehow involve role-play as well.
They chose the form of a dialogue between a user and the system to describe the use case.
They represent a single use case as a use case card. An example layout of the card is showed in the following.
Figure 4. A Use case card describing an essential use case for a banking system
They split the card with a vertical line down the centre, and write the user's lines on the left, and the system's line on the right.
This kind of layout is especially good for functional requirement because it highlights how the system is used, and how the system behaves.