This paper provides guidelines for writing and classifying scenarios for classroom practice of language skills through the strategic interaction method. The scripts, used for spontaneous or rehearsed role-playing or transactional games, are rated according to their information load (grammatical complexity), interactional value, and transactional or negotiating value. They are illustrated with a variety of scenario examples in Japanese and English. Sixteen interaction scenario topics based on common situations are described: a traffic accident, a visit to a body shop, negotiation of a deal, telephoning the previous owner of one's home, a job interview, talking with a travel agent, negotiations in a restaurant or hotel, a court scene, an employer-employee conversation, dealing with apartment neighbors, arrest for speeding, damaging someone's property, retrieving a rental deposit, being stopped for disorderly conduct, and problems common to foreigners. Techniques for classroom presentation are suggested, and types of transactional scenarios are described. The transactions include buy-sell situations focusing on positive options, negative options, and positive aggressive options. (MSE)