Individual Brainstorming is the process of you getting your ideas out on paper.
The idea is to put down all of / most of your ideas on paper. This has two advantages .
It encourages the unrestricted flow of thoughts .
It facilitates the strategic or comparative evaluation of your ideas .ie. Once on paper, you have the opportunity of ranking your ideas in terms of importance and efficacy. You may now pit your ideas against one another and choose the best ones.