I once read a great book that, whist it was not directly about radio dramas, I believe will be useful. It's
'Made to stick' by Chip and Dan Heath. They examine what makes ideas that people remember successful.
They came up with 6 principles of successful ideas:
- Simple - Does the idea get to the 'core'? Is is easy to remember? By 'simple', it doesn't mean patronizing but radio dramas must be easy to follow.
- Unexpected - Does it surprise the audience? Surprise is vital in any drama. What would you remember in a radio play: the expected or unexpected?
- Concrete - Will people be able to understand it? How will my radio drama 'paint a picture' in the listener's mind?
- Credible - Is it believable?
- Stories - Is there a story behind it? My radio play will have to have a strong, memorable narrative.
- Emotional - What emotion(s) does it create? Fear? Happiness? Empathy? Or maybe even all of them at different times?
If I follow these principles it does not necessarily mean my radio play will be successful but they will be useful when writing the script.