The proposal, the SOW, the fee, scope control, QC and feedback are all machinery. The trust equation, formalized by David Maister, Charles Green and Robert Galford in The Trusted Advisor, explains why running that machinery well is what earns the relationship. Without it, "being trusted" looks like a separate soft skill you either have or don't. The formula:
Trust = (Credibility + Reliability + Intimacy) ÷ Self-Orientation
What do the four terms mean?
Each term names something specific and checkable:
- Credibility: do your words ring true? Are you technically competent, and do the things you say turn out to be accurate? ("I trust what she says about pricing.") The proposal and the analysis itself do most of the work of building this term.
- Reliability: do your actions match your words, consistently, over time? ("I trust her to do what she said, by when she said it.") The SOW and the workplan rhythm build this term, and so does the scope-creep test. Every kept commitment adds to it, and every silently absorbed scope change or missed check-in takes a little away.
- Intimacy: is it emotionally safe for the client to share something sensitive or risky with you, without fear of exposure or judgment? ("I trust her with this problem, and not only with this fact.") Intimacy isn't friendliness, and it isn't getting along. A client can golf with an advisor every weekend and never once feel safe telling them the business is in trouble. The term measures psychological safety around the client's real vulnerabilities, and it's the one most beginners misdiagnose (see mistake 5 in common mistakes).
- Self-orientation: whose interest is being optimized: the client's or the advisor's own (billings, being seen as the smartest person in the room, winning the follow-on sale)? This is the denominator. It's no extra ingredient to add, and the formula's whole insight comes from that placement. Worked Example 2 works it through in full arithmetic.
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Why does self-orientation matter most?
Because self-orientation divides the sum of the other three, a small cut in it moves total trust by more than an increase of the same size in credibility or reliability. The denominator acts as a multiplier on the whole relationship, while the numerator terms only add. Try it on an illustrative scale of roughly 1 to 10, the kind the book itself uses to make the formula tangible. Raising credibility from 9 to 12 adds 3 to a numerator that still gets divided. Lowering self-orientation from 6 to 3 doubles the entire fraction.
That's a mechanical fact about where a variable is placed in a formula, which is a good deal stronger than a platitude about "always put the client first". It's why the highest-leverage thing you can do as an advisor is act visibly against your own short-term interest. Turn down billable follow-on work that isn't justified. Admit a mistake before it's discovered. Tell a client a true answer that reduces your fee. Worked Example 2 computes this comparison in full, and Worked Example 4 shows its highest-stakes version, the ethics of recommending less work.