HBDI Test (Herrmann Brain Dominance Instrument)

What Is the HBDI?

The Herrmann Brain Dominance Instrument is a thinking-preference model that William “Ned” Herrmann developed while he was at General Electric. It maps how you prefer to take in information, make decisions and solve problems onto four quadrants: A (rational), B (organized), C (interpersonal) and D (imaginative). Two things are worth knowing before you read your result. First, the HBDI describes preference, not ability: a low score in a quadrant says you are less inclined to lead with it, not that you cannot use it. Second, the Whole Brain model is the wider framework the instrument grew out of — it is what the four quadrants are meant to describe.

How This HBDI Test Works

You pick the 25 words from a shuffled list of 80 that describe you best. Every word belongs to one of the four quadrants, so your picks add up to a percentage for A, B, C and D — the result screen shows your strongest preference, and the link keeps that exact result if you share it or come back later. There is no timer, no account and nothing to install. Most people finish in about five minutes, and you can retake it as often as you like.

The Four Quadrants of Whole Brain Thinking

How to Communicate with Different Quadrants?

• 🔵A Quadrant (Logical): Get straight to the point, provide data and facts. Focus on What.
• 🟢B Quadrant (Organized): Provide detailed plans and steps, be punctual and reliable. Focus on How.
• 🔴C Quadrant (Interpersonal): Build personal connections, focus on feelings and interpersonal impact. Focus on Who.
• 🟡D Quadrant (Holistic): Paint a vision, use metaphors, don't get bogged down in details. Focus on Why.

HBDI vs DISC vs the 4-Color Test

These three tools answer different questions, and mixing them up is why results can start to feel contradictory. DISC describes observable behaviour — how you act around other people. The blue, green, red and yellow colour tests borrow that same colour language to sort personality types. The HBDI describes thinking preferences: how you like to take in information and make decisions. The four colours overlap with the four quadrants, which is why many people recognise themselves in more than one profile — the mapping is close, but not one-to-one. If you want behaviour, start with the DISC test. If you came for the colour framing, try the 4-color personality test. For the classic split, see the left-brain right-brain test. Stay here if the question you actually have is how you prefer to think.

Browser Test vs the Official HBDI Assessment

The official HBDI is a paid instrument administered through certified practitioners, usually followed by a debrief, and it is the version organisations use for team and leadership work. This page is a free educational self-check inspired by the publicly documented Whole Brain model. It is not a validated psychometric instrument, it does not produce an official HBDI profile, and it is not affiliated with Herrmann International. Treat it as a quick, honest first pass: if a quadrant or two resonates, the useful next step is reflection or a proper debrief — not a diagnosis.

All 80 Words in This Test

References

• Herrmann, W. E. (1981). The Creative Brain. Training and Development Journal, 35(2), 22–28.
• Herrmann, N. (1989). The Creative Brain. Brain Books.
• Herrmann, N. (1996). The Whole Brain Business Book. McGraw-Hill.