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I feel that depending on the particular production, the opening questions may differ slightly. For example, a play that has been on recently at the theatre I am interning at has been on the subject of intensive chicken farming (sounds strange, I know, but it's been very popular and got great reviews!): if I was using this play as a research subject my opening question would be along the lines of; "After seeing this production, what are your feelings towards your own eating and shopping habits?" Possible responses that I would predict to this question could vary from; "Nothing, it was just an evening out at the theatre for me." to "It's made me change the way I think about my shopping and I'm going to make an effort to avoid cheap meat in the future." In this second case, I would potentially follow up the interview with a questionnaire a couple of weeks further down the line to determine whether this participant had actually made active changes in their habits as a result of the production, or if it was simply a spontaneous response to a hard-hitting subject that actually didn't have much impact after the occasion.
I intend to plan a series of open, but focused questions; questions that permit more than a 'yes or no' response, but are focused towards the specific production that has been seen. Obviously not all plays are going to carry such a strong message, so this stage will be determined by the programmed season at the theatre during the inquiry process.