The Writers Store just published my article - How to Plan an Unscripted Documentary.
The article adds extra material to a similar chapter in Producing With Passion, a book that I co-authored with filmmaker Dorothy Fadiman.
Werner Herzog talking about planning his film "Encounters At The End Of The World" said, "I looked for people who fascinated me."
When planning an unscripted documentary, first look for what fascinates you. Then learn about it, experience it, and film it.