Question

While designing a radio script, what devices should be used by the scriptwriter to first
engage and then to sustain the interest of the listeners?

Answer 1

First of all see that you choose a topic of common interest which has relevance to larger audience. Secondly how you present your ideas would determine the catchy aspect of your sceipt. The different parts should be well connected and use the language in a simple yet powerful manner.
Lastly, you can have advertisement of 15 to 20 seconds as interesting fillers whrn you switch on from one to another aspect of your talk shoe.