Tom Krieglstein describes a three-stage brainstorming process: silent individual thinking, then small-group discussion, then full group. Introverts get time to process ideas before speaking, while extroverts must articulate thoughts in smaller settings first, leading to more thoughtful contributions from everyone.
Chapters
How do you get introverts and ambiverts a chance to share and not just let extroverts dominate the conversation? The answer is solo small large. Here's how it works after you give the group a prompt for a brainstorm. First have them write down some ideas by themselves alone on a piece of paper without any verbal communication between everyone in the group. Second then you create small group of two to four people and have them share their ideas with each other and maybe even come up with some new ideas in these small groups. Lastly open it up to the large group for sharing. Here's the benefit of solo small large introverts have a chance to process and come up with the ideas. The small group conversation will help introverts and ambiverts to have a chance to practice sharing which will make them more comfortable with sharing in the large group. Extroverts will have to take some time to think through their idea before they just blurt it out to the large group.