── ── Mental model
T-Shaped Connector
The T-shaped metaphor (deep vertical + broad horizontal) is widely used but rarely validated. Most self-described T-shapes are flat generalists — wide but lacking genuine top-20% depth in any single domain. The distinction determines whether a person can occupy a connector position: a structural hole between domains where information arbitrage creates disproportionate value. A true connector translates domain-A insights for…
How it works
Stop-rule: If practitioner already has clear vertical depth and one mapped adjacent domain, start at Step 4. If connector test fails, return to Step 2.
Step 1 — Map your vertical. Apply the top-20% test using 3 objective proxies (peer recognition, contribution record, ability to evaluate others' work, ability to solve novel problems). Gate: if you cannot clear top-20%, start with vertical deepening.
Step 2 — Map your horizontal. List adjacent domains with credible fluency. Apply the Pareto filter: which 20% of horizontal domains provide 80% of connector leverage? Rank by (a) distance from vertical and (b) presence of structural holes.
When to use it
- someone says 'I'm T-shaped' and you want to verify it
- a team can't translate insights across functions
- a person asks what career move creates the most leverage
- building a first startup team
- a domain expert is hitting a ceiling and considering broadening
When not to use it
the role requires pure depth with no cross-domain translation value; the team is tightly integrated with no structural holes to fill.
Worked example
Claude Shannon's Deliberate T-Shape Construction at Bell Labs (1940s)
Context: Claude Shannon joined Bell Labs in 1941 with deep vertical expertise in mathematical logic (his 1937 MIT master's thesis had established Boolean algebra as the theoretical foundation of digital circuits). His vertical bar was established and genuinely top-tier before he began building his horizontal.
Install this skill (free, MIT)
npx skills add deciqAI/knowledge-skills