The Trust Triangle

The four distinct assessments that make up trust — and how to repair each one specifically

What is the Trust Triangle and how do you use it?

The Trust Triangle is a model that breaks trust into separate assessments you can diagnose one at a time, rather than treating trust as a single all-or-nothing thing. In Charles Feltman’s version (The Thin Book of Trust) there are four: sincerity (I mean what I say), reliability (I do what I say), competence (I have the ability to do what I say), and care (I have your interests at heart). Trust breaks down when any one of these assessments fails — and repairing trust requires identifying which assessment was damaged, then addressing that specific one rather than trying to rebuild trust in general.

Most people treat trust as a single thing that you either have or don’t. Charles Feltman’s framework disagrees: trust is a judgment made across four separate dimensions, and knowing which dimension failed is the key to targeted repair. A colleague who is sincere and competent but unreliable has a very different problem than one who seems reliable but doesn’t actually care about your interests. The practices here apply the Trust Triangle to building, maintaining, and repairing trust in real relationships.

Practices

Diagnose which trust dimension is broken before trying to repair
Name the specific trust assessment that failed — then address that one, not trust in general.
Build sincerity by saying only what you mean
Only make commitments and assertions you actually believe — and retract the ones you don’t.
Build reliability by making smaller, keepable promises
Under-promise consistently, then exceed rather than over-promise and fall short.
Be transparent about your competence limits
Name what you can do, what you can’t, and what you’ll need to learn — before you are found out.
Demonstrate care through visible acts in the other person’s interest
Show that your interests and theirs are genuinely aligned — not only when it’s convenient.
Extend trust deliberately to invite it
Trust others first, in bounded ways, before they have earned every dimension — it is how trust is built.
Have explicit trust conversations when trust is at stake
Name the trust issue directly rather than managing it indirectly.

Practice this with IX Coach

Research

Kim, Dirks & Cooper (2009), repairing trust through specific versus general apologies, Journal of Applied Psychology
Kim, P. H., Ferrin, D. L., Cooper, C. D., & Dirks, K. T. (2004). Removing the shadow of suspicion: The effects of apology versus denial for repairing competence- versus integrity-based trust violations. Journal of Applied Psychology, 89(1), 104–118.
Kim, P. H., Dirks, K. T., & Cooper, C. D. (2009). The repair of trust: A dynamic bilateral perspective and multilevel conceptualization. Academy of Management Review, 34(3), 401–422.
DePaulo et al. (1996), lying in everyday life, Journal of Personality and Social Psychology
DePaulo, B. M., Kashy, D. A., Kirkendol, S. E., Wyer, M. M., & Epstein, J. A. (1996). Lying in everyday life. Journal of Personality and Social Psychology, 70(5), 979–995.
Tenney, E. R., Spellman, B. A., & MacCoun, R. J. (2008). The benefits of knowing what you know (and what you don’t): How calibration affects credibility. Journal of Experimental Social Psychology, 44(5), 1368–1375.
Tenney, E. R., MacCoun, R. J., Spellman, B. A., & Hastie, R. (2007). Calibration trumps confidence as a basis for witness credibility. Psychological Science, 18(1), 46–50.
Mayer, Davis & Schoorman (1995), an integrative model of organizational trust, Academy of Management Review
Colquitt, J. A., Scott, B. A., & LePine, J. A. (2007). Trust, trustworthiness, and trust propensity: A meta-analytic test of their unique relationships with risk taking and job performance. Journal of Applied Psychology, 92(4), 909–927.

Related concepts

The Trust Equation, Made Practical
The four trust levers and why self-orientation is the denominator that matters most
Radical Candor, Made Practical
The 2x2, the mechanisms behind real candor, and an honest read on the evidence
Crucial Conversations, Made Practical
Safety, mutual purpose, STATE, and the stories that drive us
Nonviolent Communication (NVC), Made Practical
The four components, the mechanisms behind them, and an honest read on the evidence

Frequently asked questions

What is the Trust Triangle and how do you use it?

How do you diagnose which trust dimension is broken before trying to repair?

When trust breaks down, the instinct is to apologize for "not being trustworthy" — a global statement that addresses none of the four dimensions precisely. Feltman’s insight is that each dimension fails for different reasons and requires different repair. Sincerity failures require honesty correction; reliability failures require behavioral follow-through; competence failures require capability building or role clarification; care failures require visible alignment of interests. Generic trust repair misses the specific lever.

How do you build sincerity by saying only what you mean?

Sincerity trust is damaged incrementally by small misalignments between what is said and what is meant — social white lies, overpromising to avoid conflict, saying "I understand" when you don’t. Each instance is small; cumulatively they create the sense that the person’s words are not reliable guides to their actual state. The repair and the prevention are the same: close the gap between internal state and verbal output.

How do you build reliability by making smaller, keepable promises?

Reliability trust is built by the ratio of promises kept to promises made — a ratio that degrades fast when ambition outruns capacity. The common failure is making large, aspirational commitments that feel motivating to state but are routinely unmet, while the relationship learns that promises are estimates. Deliberately scaling down to commitments you can guarantee shifts the evidence base: every kept small promise adds to the reliability account.

How do you be transparent about your competence limits?

Competence trust is damaged in two ways: by genuinely lacking ability, or by overstating ability and being caught. The second is far more damaging, because it combines a competence gap with a sincerity failure. Proactively naming the limits of your competence ("I know this domain well; this adjacent area I’d need to research") protects sincerity trust and gives the other person accurate information with which to calibrate their reliance on you.

How do you demonstrate care through visible acts in the other person’s interest?

Care trust is the belief that the other person considers your interests, not only their own. It is damaged when someone appears to act in their own interest at the other’s expense, even if unintentionally. The repair and the building are the same: make visible the ways in which you considered their interests — especially when it cost you something. Visible sacrifice or advocacy that benefits them at some cost to you is the strongest care signal.

How do you extend trust deliberately to invite it?

Feltman also defines distrust: the decision to not rely on another’s sincerity, reliability, competence, or care. Trust cannot be demanded, only invited — and it is built by extending it first in low-stakes situations, providing the other person the opportunity to demonstrate trustworthiness. Demanding full trust before any extension is a self-fulfilling trap: neither party can demonstrate they’re worthy of it.

How do you have explicit trust conversations when trust is at stake?

Trust problems are almost universally handled indirectly: through avoidance, rumor, or escalation rather than explicit conversation. Indirect management allows assumptions to harden and the relationship to drift further. An explicit trust conversation — "I want to talk about something that has affected my trust in you" — is uncomfortable but is the only move that addresses the underlying assessment rather than its symptoms.