Four Sources of Credibility

A seal, and a complaint

In 1909 Good Housekeeping magazine established its Seal for products advertised in its pages. The products were tested, and today the Seal comes with a two-year limited warranty.

It worked because it was borrowed trust. A reader who did not know the toaster company knew the magazine.

In 1939 the Federal Trade Commission filed a complaint over the magazine's "misleading and deceptive" guarantees. The ruling went against the magazine, and the words "Tested and Approved" were dropped from the Seal.

The magazine kept growing anyway. The Seal stayed, in a more careful form.

Two lessons in one story. Credibility can be borrowed, and the borrowing has rules.

Four places credibility comes from

When a buyer decides whether to believe you, they draw on four sources. We call them the Four Sources.

Results. What customers say happened after they worked with you.

Borrowed. Someone the market already trusts, saying you are worth trusting.

Record. Your documented past work. What the job was, what changed, what happened.

Story. Your own true account of how you came to do this.

This is different from the evidence for an offer, which we cover in the Proof Grid. These four answer a narrower question: why should I believe this person?

Results: testimonials that say what happened

Most testimonials are about likability. "Great to work with." "Really nice people."

Those are pleasant and nearly useless. A buyer is not deciding whether you are nice.

A useful testimonial names a specific change and a specific result. What the customer did, what you changed, and what moved.

There is a rule here. The FTC says endorsements claiming specific results will usually be read as what others can expect, and "results not typical" does not change that.

So you have two choices. Have proof the result is typical, or state the typical result clearly next to it.

And never write them yourself. The FTC's 2024 rule bans fake reviews and testimonials, including ones that misrepresent who wrote them.

Borrowed: endorsements and the halo

An endorsement lends you someone else's trust. If a buyer trusts the person, some of that trust transfers to you.

It can transfer even when the endorser knows little about the subject. People tend to let one good impression color their judgment of other traits, a pattern called the halo effect.

That is why endorsements work, and why they are regulated. If the endorser is paid, given something of value, or related to you, the connection should be disclosed clearly.

The best endorsements for a small firm are rarely celebrities. They are respected people in the buyer's own world: a trade association, a well-known peer, a partner firm.

Ask for a specific sentence they are comfortable standing behind. A vague compliment from a respected name is still vague.

Record and story: the two you control

Your record is the one source nobody can give you. It is built one documented job at a time.

Write each one up the same way. What the situation was, what you changed, what happened, with numbers you can show.

Then repeat your three to five strongest points everywhere: site, proposals, ads, calls. Our rule of thumb is that a buyer should hear the same few facts so often that they could repeat them.

Your story is the fourth source. Buyers trust people who seem like them, a tendency researchers call homophily, so a real account of where you started can do what credentials cannot.

It must be true. Do not invent a low point, borrow someone else's hardship, or inflate the numbers. A story is a claim like any other, and a false one is deception.

Tell it plainly. The facts of a real story are usually enough.

"I am new. I have none of the four."

You have more than you think, and the first one is easy to start.

Do one job well and document it carefully, with the client's permission to use the result. That is your record and your first testimonial at once.

Borrow credibility honestly. A partner firm, a past employer, or a professional body can vouch for the skills you already have.

Your story is available on day one, because it is just the truth about why you do this work.

For how to position yourself before the record exists, see experience vs experienced.

What to read next, and why

FTC's Endorsement Guides: What People Are Asking (FTC guide): The plain-language rules for testimonials, results claims, and disclosures.

FTC rule banning fake reviews and testimonials (FTC press release): What became illegal in 2024.

Source credibility (encyclopedia entry): The research on why we believe some speakers more than others.

Good Housekeeping (encyclopedia entry): The Seal's history, including the 1939 complaint.

So the simple takeaway is this: list what you have under each of the four sources today, and fix the weakest one first.