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When picking a monologue, remember that you are essentially choosing a tool to sell yourself as an actor. Select material that brings out your acting strengths and shores up any weaknesses that you may have. The monologue should be just right for your level of training. Always (as in, ALWAYS) read the entire script from which the monologue is extracted. Not only will you get a better insight into the character, you may be asked by the casting director to discuss the play (or film) and its themes. This is their way to see if you will be able to work through the themes of the piece for which they are hiring you.