Dave Wittenberg: You have to have all of the normal aspics of acting. Your intention, your character your voice, knowing who you're talking to, knowing what your trying to get across. But you are restricted in how long and in what intensity you can say things cause if the character on the screen is speaking in just a few flaps you've got to fit your line into those flaps so you've got to get all of the other things that you would normally do in to a very restricts period of time, and the other thing is; if your intention, your inclination, if you read a line on the page might be to yell it but but the character has a very calm face then you can't yell. So you've got to find another way to make your performance live within those rules.