There are various ways for mapping out the storyline that you will use for a story. One of them is to create a bullet-point outline, which would theoretically be useful because of the hierarchy system that you can make, but as it goes along you can't really visualise how the story goes along. Another system would be to use mindmaps to map out the storyline, because subsets of one idea could be branched off.
What ways do you use to map out your storyline/content?