What are the differences between writing fiction and non-fiction?

From the Page to the Screen

Stranger Than... a series of 15 non-fiction classics, coming to a bookseller near you. To mark the collections launch, Perennial, Foyles and 5th Estate organised a collaborative day-long celebration, where a host of published writers and book industry folk discussed how non-fiction works, how to write non-fiction and why the format is so successful.