Keep one branch of thought one color and another branch a different color.
Attach more paper if necessary. Break the "on the page mentality."
Don't get stuck in one area, keep your ideas flowing. Do not be discouraged if some of your branches prove unpromising. Just start at the central idea and work your way out again.
No censorship is allowed in this type of invention.
Record what you are thinking by speaking out loud.
Do revision once a week after making the mind map.
Revise it for once a week after make the mind map.