I think this might be what you're talking about - it's a method of outlining a story - here's a quote from a writer's tip website on it:
Good for right-brain types. A 'mind map' is sometimes referred to as 'a cluster diagram', or 'branching', or simply 'brainstorming'. Basically, you dump lots of ideas on a page so you can see the plot at a glance. Circles, arrows, lines and scribbles tend to be representative of this method of plotting.
Lots of writers find this method works wonders. While they scribble and link ideas, they are organizing the story in their minds. Although there's not a lot on the page, there's plenty going on in the grey matter. All of this 'sticks', and provides enough of a path so writers don't lose their way.
The Advantages Of This Method:
The Disadvantages Of This Method
- It's a good compromise. You have planned a route for your story, but you have plenty of room for side excursions if a better idea should occur.
- It feels comfortable for those who think more clearly when they use diagrams or pictures.
- It doesn't take up too much time.
- It can make some writers feel more confused than ever.
- It doesn't provide enough of a path for more organized writers.
From this link: Many Paths to Plotting -
Hope this helps - there are other plotting methods listed there as well.