The H3 Self-Assessment Radar (T01) maps where Hand, Head, and Heart sit in your current development. The full instrument is in the Tools section at the back of the book. The discipline that makes it useful is the part most assessment instruments cannot teach: how to score yourself without flinching.
Three movements structure the assessment.
Rate each mode independently, against specific behaviours: Anchor each rating on specific recent behaviours rather than a general sense of competence. Left to instinct, most practitioners average their self-image into scores clustered around “moderately strong” in everything. For Hand: when did you last judge a craft decision against an internal standard you can articulate, not a tool default? For Head: when did you last refuse a brief on the grounds that the problem it stated was not the actual problem? For Heart: when did you last let a research finding change a design direction you were already committed to?
Identify your π profile: The specific shape your strengths take, which is rarely uniform and almost never matches the “balanced triple-threat” the industry sometimes pretends to expect. Most practitioners are stronger in one mode, moderately developed in a second, and notably weaker in the third. A Hand-strong, Head-moderate, Heart-weak profile is the most common pattern in IC designers from craft-heavy training routes. Heart-strong, Hand-moderate, Head-weak is common in designers from research or service-design backgrounds. A Head-strong profile with thinner Hand and Heart is common in designers who moved in from product management or strategy. None are wrong. They are starting positions. The π-shaped framing that makes the profile actionable comes in Part Two (Chapter 7).
Identify the gap that is hurting the work most: The weakest mode is not always the one to develop next. The relevant question is which gap is most actively producing failure in the work the practitioner is currently doing. A designer with strong Hand, moderate Head, and weak Heart who is working on internal tools with a well-understood user population and a reliable brief may not be held back by the Heart gap right now. The same designer joining a consumer product team would feel it immediately. The diagnostic: in your last three significant decisions, which gap most affected the outcome? That is the gap to work on first.