Move to the next branches. These should be thinner than the first. Think about the things that relate to your first subcategories. What are the important issues or facts related to them? In our example, what do you associate with airports? Delays? Security? Expensive food?
You would then draw a line for each of these that branches off from the line for AIRPORTS. You’d give it a name, such as SECURITY.
Again, use color and images.[23]