Continue branching out. You continue in this fashion as long as needed to complete your mind map. The lines will continue to become thinner as sub-categories become increasingly comprised of supporting details like facts or dates. You will also add branches to those you’ve already created. You might even add another first branch after discovering something you didn’t know.
Some also suggest making subcategories hierarchical.
Therefore, if “delays,” “security” and “expensive food" were all subcategories, you’d draw three lines or branches – one for each. Then you’d put what you consider to be the most important sub-category on the top or uppermost line.[24]