As the actor, I would apply the system to the role of Mosca in order to perform in a more convincing manner. Stanislavski's system focuses on the point that the actor should be very realistic in terms of the character he is playing in order to fulfil his role credibly, and I would do this by applying the system as appropriately as possible.
I would begin my characterisation of the role by initially focusing on 'external research'. This is studying the character's moods and actions before actually playing his/her role. The reason I would do this would be to enable me to focus and develop an understanding of the role which I was about to act. I would begin with 'given circumstances'.
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