I do not use a written outline. I get an idea and I write. Sometimes I have to rewrite to get a better story. As a old newspaper reporter, there was no time to write an outline of your coverage of a three hour city council meeting where a budget was approved, police chief fired, a long fight and indecision about a road project. You just sit and type.
I am working on a book. In my mind I have developed the order of what I am going to write, but it is not a piece of fiction.
I do believe if I ever wrote fiction, I would have a brief outline about introducing characters, describing the setting, establishing the plot, developing the obstacles that lead to the desired result and the conclusion.