Where television luridly reveals everything, radio is coy; radio conceals its sources. It is a voice behind a curtain, and you must provide the face. Or, if you do not keep your radio behind a curtain, as I do, you can imagine it as voices in the next room. This is what makes radio so powerfully consoling to the lonely — it creates the illusion of company in a way that few other media can.
— John Hodgman in The Transom Review

Radio is an ephemeral medium. Each word and sound is gone as quickly as it arrives, and listeners can’t go back and reread something to remind themselves who’s who and what’s what. It’s also a medium from which people are easily distracted — they’re almost always doing something else while they’re listening. So make sure your writing is clear, vivid and engaging. Don’t get bogged down in unnecessary detail. Use shorthand and summarization, round numbers and comparative figures, whenever possible and appropriate. Keep your characters and voices clear and distinct. Pay close attention to transitions between scenes and themes, and make good use of signposts — where we’re going — and reminders — where we’ve been.
— Peter Thomson, environment editor for PRI’s The World