Brainstorming

Brainstorming is a group creativity technique by which efforts are made to find a conclusion for a specific problem by gathering a list of ideas spontaneously contributed by its members.

Brainstorming
Wikipedia
7 Unique Brainstorming Techniques
Inc
5 Powerful Ways to Brainstorming with Teams
Above The Fold Design
25 Brainstorming Tips
TAXI
13 Unusual Brainstorming Methods That Work
Huffington Post