Brainstorming, NGT & Multivoting

Brainstorming, NGT & Multivoting (CSSGB BoK II.F.3 — Apply)

Quick Answer: Use brainstorming (or structured variants) to generate many ideas without early criticism. Use Nominal Group Technique (NGT) when status differences or loud voices would skew open brainstorming. Use multivoting to prioritize a long list into a short list for data collection or further analysis—not as a substitute for root-cause proof.

BoK II.F.3 is Apply. CSSGB expects you to pick the right ideation and prioritization tool when a team is stuck, dominated, or drowning in sticky notes.

Why Structured Idea Tools Matter

DMAIC needs broad thinking in Define (what could be in scope?), Measure/Analyze (what might cause the defect?), and Improve (what countermeasures exist?). Unstructured meetings fail when:

• The highest-ranking person speaks first and everyone agrees (groupthink)
• Two experts debate while others disengage
• The team confuses “we voted” with “we proved the root cause”

The cure is separate generation from evaluation, then prioritize with a transparent method, then test survivors with data.

Brainstorming

Brainstorming is a group method to produce a large quantity of ideas in a short time. Classic guidelines:

1. Defer judgment — no criticism or ranking during generation
2. Encourage quantity — volume first; quality later
3. Welcome wild ideas — stretch thinking; tame later
4. Build on others — combine and improve
5. One conversation / capture all — scribe or digital board visible to all
6. Stay focused on a clear prompt (“causes of late shipments from Dock 3”)

Useful variants

After generation: affinity-group related ideas, clarify wording, remove pure duplicates. Only then evaluate.

Exam trap: Calling a meeting a “brainstorm” while the champion immediately shoots down ideas violates defer-judgment and suppresses contribution—functionally closer to groupthink pressure than true brainstorming.

Nominal Group Technique (NGT)

Nominal Group Technique is a structured process that makes the group “nominal” (in name) during idea generation so individuals think before social influence takes over.

Typical NGT steps

1. Silent generation — each person writes ideas privately to a clear question
2. Round-robin recording — one idea at a time from each person onto a shared list; no debate yet; cycle until lists are empty
3. Clarification — discuss only to understand meaning; still avoid hard selling
4. Voting / ranking — private votes (often ranking top N or allocating points)
5. Discussion of results — examine the tallied short list; optional second vote

Why NGT beats open brainstorming in some rooms

NGT directly counters dominant, overbearing, and reluctant dynamics from II.F.1 by forcing silent input and equal sharing. It also reduces groupthink by preventing the first loud idea from anchoring the room.

Multivoting

Multivoting (multi-voting) helps a team reduce a long list (often 20–50 items after brainstorming/NGT) to a workable few.

Common procedure

1. Display the clarified list (numbered).
2. Give each person a fixed number of votes (rule of thumb: about one-third of the item count, or a set like 5 votes).
3. Allow one vote per item or allow stacking (house rule—state it in advance).
4. Tally votes publicly.
5. Eliminate low-vote items; optionally re-vote on the remaining set (second multivote).
6. Carry the short list into data collection, C&E matrix, FMEA, or pilot design—not into “we’re done.”

Multivoting vs single ranking vs consensus

Dot voting is a visual multivote (stickers on a board). Same logic applies.

Recommended Sequence on Projects

A clean Apply-level sequence for “why are invoices late?”:

1. Clarify the question (problem statement / CTQ context).
2. Generate causes with silent brainstorm or NGT (if hierarchy is strong).
3. Cluster with affinity diagram (often taught with management tools).
4. Multivote to a short list for verification.
5. Verify with data (Pareto, stratification, hypothesis tests)—votes never replace Measure/Analyze.
6. Repeat generation for solutions in Improve, then multivote candidates before effort/impact or FMEA scoring.

Facilitation Tips

• Write the prompt where everyone can see it.
• Timebox generation (e.g., 7–10 minutes silent).
• Park evaluation phrases (“that won’t work”) until the voting phase.
• Make voting rules explicit before ballots go out.
• Record who facilitated and what the short list was in project documentation.

Exam Focus

• Know when to choose NGT over free brainstorming (power imbalance, dominance, need equal voice).
• Know multivoting narrows lists; it does not prove causation.
• Know the order: generate → clarify/cluster → vote → analyze.
• Match tool to dynamic: reluctant team → silent generation; rush to accomplishment → stop evaluation during brainstorm.

Master these three tools and you can run fair workshops that feed—not replace—the statistical and process analysis the Green Belt is certified to apply.