The Brainstorming activity is an exercise in creativity. Make no judgements of any ideas during Brainstorming. There are two sides to the brain. One is strong in creativity, the other is strong in judgement and analysis. Lock the Judge in the closet during Brainstorming The wilder the idea the better.
Wild ideas can lead to practical solutions.
Subsequent ideas may feed off of an earlier idea and there must be a record to go back to. There are no bad ideas . Some will be less effective than others, but every idea is to be respected because it may be the basis for the final solution. Now you can let the Judge out of the closet. Evaluate each brainstorming idea.