When someone extemporizes, you can’t be certain what they will say, or how long they will speak for. It’s far more convenient if they can work to a scripted dialogue – which, in most cases, has been written by someone else. But how do you ensure that someone is going to deliver this script?

Approaches to presentation

Reading to camera from a script Seldom really effective. The reader often looks preoccupied, stilted and unnatural.

Working to notes. Often successful for experienced speakers, but liable to

Learned script. Even an actor who is used to committing long passages to memory may not have time to learn the lines.

Sometimes you can get round the difficulty by having someone read a ‘voiceover’ commentary to the pictures. ...

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