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Due Diligence on Character

By Stan Tscherenkow · Published April 2026 · 11 min read

Quick Answers

Why is character due diligence harder than financial due diligence? Financial due diligence has a defined format, a defined data set, and a defined output. Character due diligence has none of those. The information is not presented, it has to be elicited. The data does not sit in a file, it sits distributed across people who have reasons to withhold it. And the output is a judgment, not a number. Most teams default to the financial work because it is legible and stop there. The failure rate of deals and partnerships is largely the cost of that default.

What does character due diligence actually consist of? Four practices that are simple to describe and difficult to execute. First, backchannel references outside the list the other party provides. Second, pattern observation across low-stakes interactions over time, not concentrated in one meeting. Third, explicit stress conversations where disagreement is introduced deliberately. Fourth, checking the story against the evidence: how they describe their prior exits, partnerships, and conflicts, compared to what those same situations look like to others who were present.

What are the most common failure modes? Treating character as a sentiment check (do I like them) rather than a structural read. Accepting the reference list as the reference process. Compressing the read into a single long dinner where everyone is performing. Weighing competence signals (track record, credentials, presence) as a substitute for character signals. And the single biggest one: finding a character signal you do not like and rationalizing it because the commercial case is strong. The rationalization itself is the diligence failure.

What do you do when the signal is mixed? Mixed signals are the normal case. Almost no person produces a unanimous character read. The question is not whether the signals are clean. It is whether the pattern underneath them is consistent. When the signal is mixed, the work is to name the specific pattern you are worried about, structure the deal or relationship so that pattern cannot produce its typical consequence, and establish the concrete test that would tell you the pattern is live. If you cannot do those three things, the diligence is not complete.

Almost every failed deal, partnership, or senior hire I have watched up close failed for a character reason that was visible during diligence. The financial work was thorough. The character work was absent.

Why character diligence is structurally harder than financial diligence

Financial due diligence is a defined genre. There is a format. There are templates. There is a data room with files in it. The numbers are audited, or they are not, and that distinction is itself a signal. The output is quantitative. Two good teams running the same financial diligence on the same company will produce reports that agree on most of the material questions.

Character diligence has none of that infrastructure. The information is not presented, it has to be elicited. The data does not sit in a file, it sits distributed across people who have their own reasons to withhold it or shade it. The output is a judgment, not a number. And two capable advisors running character diligence on the same person can reach different conclusions, because the work involves interpreting signals that do not have fixed meanings.

The asymmetry produces a predictable failure. Teams default to the work that has structure. They run the financial diligence thoroughly because there is a clear process to follow. They run the character diligence as an afterthought because there is no process, or the process they use is too thin to surface anything the other party does not want surfaced. By the time something goes wrong, the financial diligence looks prescient in hindsight (the margin compression was there, the customer concentration was flagged, the working capital issue was noted) and the character diligence looks retrospectively obvious (three people we could have called said he had done this before).

The failure rate of deals and partnerships is largely the cost of that default. Not because financial diligence is wrong, but because it is being asked to do work it cannot do. Numbers do not tell you whether the person on the other side of the table is going to behave the way a deal memo assumes.

What character diligence actually consists of

There is no perfect method. There is a set of practices that, used together, produce a more accurate read than the alternatives. None of them are novel. Most of them are not practiced because they are uncomfortable, slow, or require access the acquiring party does not think they have.

Four practices that constitute a real character read

Backchannel references outside the list. The references a person provides are selected. They have been coached, directly or implicitly, on what to say. The useful references are the ones you find on your own. Former direct reports, former partners, counterparties from prior deals who have no reason to still be loyal. The time you spend finding those references is the time that separates real diligence from the ritual version.
Pattern observation across low-stakes interactions over time. People perform in high-stakes interactions. They are themselves in low-stakes ones. How they treat the waiter. How they handle small scheduling conflicts. How they respond when a minor term is not exactly what they wanted. How they speak about people who are not in the room. These are not cliches, they are data. Compressed into one long dinner they mean nothing. Observed across five or six small interactions over a few weeks they are diagnostic.
Stress conversations introduced deliberately. You cannot read someone under disagreement until there is disagreement. Most diligence processes never produce one, because both parties are selling. Introduce a real disagreement on a real term. Not a manufactured one. Something you actually want differently. Watch how they hold position, how they move, and what they do to you while they move. The way someone negotiates with you is the way they will negotiate about you when you are not in the room.
The story versus the evidence. Ask how their previous partnership ended. Ask about the exit they had. Ask about the senior hire they fired. Then find two or three people who were present for those situations. Compare. The gap between the story and the evidence is the single most predictive piece of data in the entire diligence, and almost no one runs it systematically.

None of this is complicated. Most of it is the kind of work that people with time and resources decline to do, because it takes longer than the commercial timeline and it puts pressure on relationships. The people who do it consistently get a different distribution of outcomes on the other side of the work.

The failure modes that cost founders most

Character diligence fails in specific ways. Recognizing the mode is the first step toward not repeating it.

The first failure is treating character as a sentiment check. Do I like them. Do I get a good feeling. Could I work with them. These are not character reads. They are rapport reads. Rapport is the thing most easily manufactured by someone who does not actually have the character you need. The people who have done the most damage to founders over the last two decades were people those founders liked, often quite a lot, right up until the thing happened.

The second failure is accepting the reference list as the reference process. The references on the list are not going to tell you anything useful. If they were going to, they would not be on the list. This is not a moral failing of the references, it is a structural property of the exercise. The work is finding the references that are not on the list.

The third failure is compression. The single long dinner, the two-day offsite, the concentrated window in which everything is supposed to become clear. Concentrated interactions produce performance. Distributed interactions produce character. If the diligence timeline will not accommodate distributed observation, the diligence is already compromised.

The way someone negotiates with you is the way they will negotiate about you when you are not in the room.

The fourth failure is substituting competence signals for character signals. Track record, credentials, presence, articulateness. These are signals of capability. They are not signals of character. In fact, the more capable someone is, the more effectively they can present a character that is not theirs. Competence and character are orthogonal variables. Reading them as correlated is one of the most expensive mistakes in founder judgment.

The fifth and worst failure is rationalization. You run the diligence. You find a signal you do not like. The commercial case is strong. You construct an argument for why this particular signal does not apply here, or why it is an exception, or why the upside justifies the risk. The argument may be internally coherent. That is what makes it dangerous. The rationalization itself is the diligence failure. What the work surfaced was a pattern. What you did was decide, under pressure, not to act on it. The person who cheats in one room extends this point into the specific pattern of how small character signals predict large behavior.

What to do when the signal is mixed

Almost no person produces a unanimous character read. Some references are glowing. Some are cautious. Some small observations are reassuring. One or two are concerning. The signal is always mixed. The question is not whether the signal is clean. It is whether the pattern underneath it is consistent enough that you can name what it is.

Three moves when the signal is mixed:

Mixed-signal protocol

Name the specific pattern, in a single sentence. Not "I have some concerns." Not "the references were mixed." The specific behavioral pattern you are worried about. "Under pressure, this person tends to reallocate costs to partners." "When a deal is not going their way, this person tends to re-trade on terms that were agreed." If you cannot write the sentence, the diligence is not complete.
Structure the relationship so the pattern cannot produce its typical consequence. Not the generic "we will trust but verify" language. A specific structural change. Escrow. Milestone payments. Board oversight. A co-signer on decisions in the relevant domain. If the pattern is the one you named, what prevents it from landing as it usually does?
Define the concrete test that would tell you the pattern is live. What behavior, if you saw it in the first six months, would mean the pattern is happening here too? Write it down. Share it with one person outside the deal who will hold you to looking at it.

If you cannot do all three, the diligence is not complete. Proceeding under ambiguity, without naming the pattern, without structuring against it, and without a concrete test, is proceeding without diligence. The documented case where this sequence was not run sits in the senior executive hire that backfired. The same logic applied to partnership decisions lives in when a business partnership becomes a liability.

The hardest thing about character diligence is that the work produces uncomfortable findings, and uncomfortable findings create the temptation to discount them. The discipline is acting on a signal that is inconvenient. Most of the damage comes from discounting a signal that was there. Almost none of the damage comes from declining a deal on a signal that would have been fine. The asymmetry should change how you weight the evidence.

If you are running diligence on a person and the signal is telling you something, the signal is the diligence. Not the commercial case, not the timeline pressure, not the sunk effort on the transaction. The signal is what you paid for. Act on it.

If you are carrying a deal, a partnership, or a senior hire where the character read has not been done yet, the conversation that gets it named usually takes one hour. Bring it before it closes.

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Stan Tscherenkow Private Business Advisor Two decades operating across Europe, Russia, Asia, and the United States.

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