Reverse Brainstorming, where participants come up with reasons why the problem can't be solved to inspire new solutions.
Phillips 66 Brainstorming, where six groups of six people brainstorm for six minutes and then present solutions.
Speedstorming, individuals use each 5 minutes to create 4 ideas that are shared with the next person to build on for a total of 3 times.
Brainwriting, each person generates ideas individually first and then only shares the best ones.
Group Passing, individuals write 1 idea and share it until they have received feedback from each person on their idea.
Question Brainstorming, each idea should inspire a question which in turn should inspire new ideas.
Mind Mapping, a visual way where the problem or question is branched out from the center to form a web of ideas.
Focus Group, where one concept or idea is presented for a pre-selected group of people for feedback.
Figure Storming, or the participants imagine being in someone else's shoes when they generate ideas; also called Role Storming.
The Stepladder, where people are introduced one at a time to encourage even shy participants to get involved.
Crawford's Slip, each participants has a limited number of submissions and time, ideas are grouped by topic and merged where possible.
Starbursting, where people are encouraged to generate questions before ideas are generated.
Charette Procedure, teams rotate topics and brainstorms their best solutions which are prioritized in the end.
Round-Robin Brainstorming, where people contribute an idea or feedback one at a time in a pre-assigned order.