The document defines key terms used in radio news programs such as headlines, bulletins, news programmes, copy only, voicers, wraps, live crosses, and two ways. It then analyzes the structure of the BBC Radio 4 program "World at One" which includes using bulletins to outline stories, audio clips to introduce topics, voicers for pre-recorded reports, headlines to grab attention, and crosses and two ways to discuss topics with reporters in the field and studio. The program aims to cover stories in an unbiased way and ends by recapping the headlines.