Trust Equation
The Trust Equation
What is the Trust Equation?
- Trust = (Credibility + Reliability + Intimacy) ÷ Self-Orientation
- Keeping small promises (reliability) is the practical lever
- Putting your own results first inflates the denominator
What the Trust Equation really changes is how you handle trust. The impression that 'that rep just doesn't feel trustworthy' gives you nothing to work on, but once it is broken into four variables, which item to fix, and how, over the next few weeks becomes a coaching task right away. The point not to miss is that this formula is division, not addition. However much you grow the numerator, if the denominator doubles the result is cut in half, and the denominator moves much faster than the numerator. That is why a relationship built over three years can collapse under a single quarter-end crunch.
The four elements recover at different speeds. Reliability rises noticeably within 4–8 weeks just by keeping deadline promises, and credibility follows fairly quickly once people start reading and speaking about the numbers in the customer's industry. Intimacy, by contrast, has to reach the point where customers volunteer unfavorable information such as internal opposition or budget cuts, so it usually takes two to three quarters. That is why the first item to work on is usually reliability. It also helps to draw clear boundaries. Intimacy is not the same as personal friendship or customer satisfaction survey scores. Even if you have shared ten meals, if the customer cannot bring up internal politics, intimacy should be considered low.
The most common mistake in the field is reading this as a demand to reduce self-orientation to zero. Some reps then never raise the product, just listen and miss the moment to close. Self-orientation is not about whether you have your own interests; it is about whether you put those interests ahead of the customer’s judgment. Repeating 'this isn’t the right time' without any basis also reads as poor preparation rather than consideration, and it only erodes credibility. Feeding diagnostic results into performance review scores is risky too. The moment self-reported scores all converge on the 4s, you lose the material you need for coaching.
John KimAuthor of “B2B Marketing Design” and CEO of Nanum Consulting
Sangmi LeeInstructor specializing in CS, leadership, and communicationThis formula was introduced by David Maister and colleagues in their 2000 book The Trusted Advisor. It was created to explain how professional services providers earn trust as advisors, and it has since been widely cited in B2B sales training.
Consider a hypothetical case. Company A, an industrial automation parts distributor with 240 employees and annual revenue of about KRW 90 (≈ US$1) billion, saw its new-order win rate fall from 31% to 19% over two consecutive quarters. Five of its 8 salespeople said 'customers take the quote and stop responding,' and the head of sales, saying 'it comes down to weak relationships,' was considering raising the entertainment budget.
- The consultant pulled 40 meeting records from the past 6 months and scored the four elements on a 5-point scale. Credibility came in at 4.1 and intimacy at 3.4, but reliability stood alone at 2.6.
- When we counted Manager Park’s emails, only 6 of the 17 that said 'I’ll send it by tomorrow' met the deadline, and the client’s purchasing manager said, "That company’s materials always arrive a day late."
- Analysis of 8 meeting recordings showed that in the first 10 minutes, the team spent an average of 6 minutes 40 seconds introducing its own product lineup and barely 1 minute asking about the customer's equipment, and Manager Kim admitted, "I need to lay out the products first to feel at ease."
- For 8 weeks, the team committed to just one rule: promise deadlines a day early, and if a deadline looks at risk, call the day before. Each week’s meeting opened with 5 minutes showing every person’s on-time rate on screen.
- On a deal with a tight delivery deadline, Manager Park said, "We can't meet this volume. Please check competitors' stock first," and three months later that customer invited Company A first to bid on its annual unit-price contract.
- After 8 weeks, on-time delivery rose from 35% to 89%, and the win rate on new deals the next quarter rose from 19% to 27%, while entertainment spending actually fell 12% from the previous quarter.