Effective brainstorming — governed by the principles of deferred judgment (no evaluation during generation), quantity over quality (more ideas are always the goal during divergence), combination and building (every idea can be combined with or extended by others), and wild idea permission (the most unconventional ideas often contain the seed of the most original practical solution) — is a structured divergent thinking process that, when properly executed, consistently produces a richer idea landscape than unstructured thinking.
Role
Most people have experienced brainstorming sessions that felt productive but produced mediocre results — because the sessions were conducted without the non-negotiable constraint of deferred judgment, allowing the most senior, most confident, or most verbally fluent person in the room to implicitly evaluate ideas as they emerged, causing others to self-censor. Research on group brainstorming shows that individuals brainstorming separately and then combining results typically outperform interactive group brainstorming — because social evaluation pressure suppresses generative freedom in group settings. Understanding the conditions under which brainstorming actually works versus when it produces the illusion of creativity is a practical creative leadership skill most people have never been taught.