Name the mistake and lead with the fix. Apologise fully for a competence mistake, deny a false accusation of dishonesty firmly, and after real deception expect trust not to come fully back.
The deal stopped because of something you did: a missed deadline, a wrong number in the proposal, a promise the product did not keep.
Name the mistake, say what you are doing about it, and choose how to say it by the kind of mistake it was. The research behind this splits mistakes in two. A competence mistake says you did not know how. An integrity mistake says you knew and did it anyway. The repair that helps one works against the other. For a competence mistake, apologise fully and show what you have changed. If you are accused of dishonesty and the accusation is false, deny it firmly, because an apology concedes that you are the kind of person who would do it. If you did deceive the buyer, expect trust not to come fully back.
So the first question is which kind of mistake the buyer thinks they are looking at, and the second is whether they are right.
Corporate Visions' apology sequence. Tim Riesterer's post sets out five parts in a fixed order: the offer to put it right first, then taking responsibility, the commitment not to repeat it, the explanation, and the expression of regret last. It gives sentence starters for each part and four worked messages: a missed deadline, a billing error, a product failure and a bad support call. It also names lines to drop, among them apologising for "any inconvenience", pointing to policy, and "sorry you feel that way". Corporate Visions sells the messaging training this sequence comes from.
The same mistake, repaired two ways. Roy Lewicki, Beth Polin and Robert Lount printed every part of their test apologies as finished sentences, written around a client's tax return filed incorrectly. The explanation and the commitment not to repeat it are written twice, once for a competence mistake and once for an integrity mistake. It is the clearest published example of one event getting two different repairs.
Aaron Lazare on naming the offence. Writing in Psychology Today, Lazare rules out the general apology and requires the specific one. The explanation's job is to show the act was not typical of you, and repair is a concrete offer, not a phrase. He calls the apology that skips responsibility a pseudo-apology.
The channel matters for one kind of mistake. Stephanie Mangus and colleagues ran three studies with B2B customers and professionals, published in 2024 and summarised by the authors for Baylor's Keller Center. They separate relationship mistakes, where the buyer feels taken for granted, from process mistakes such as wrong information or a missed deadline. Meeting face to face or by video reduced the damage from relationship mistakes and made no difference for process ones, where the authors conclude email is enough. The summary gives no effect sizes.
Professional buyers judge the recovery against what they expected. John Hansen, Donald Lund and Thomas DeCarlo ran two studies with professional buyers, published in 2016. Buyers who saw the salesperson as customer-focused reacted more strongly to the mistake itself, and their verdict on the whole episode turned mainly on whether the recovery matched what they expected. The abstract gives no figures.
The vendor's own test of the order. Corporate Visions says it ran a study with Nick Lee of Warwick Business School in which over 500 people in North America and Europe read about a supplier's serious service failure and then one of five responses using the same words in different orders. The offer to put it right first and regret last won on willingness to keep buying, to recommend, and confidence that the problem was closed. The version with the emotional parts removed came at or near the bottom. Corporate Visions sells the training and publishes no effect sizes or method.
Apology or denial depends on the kind of mistake. Peter Kim, Donald Ferrin, Cecily Cooper and Kurt Dirks ran two studies, published in 2004. Business students played a manager hiring a senior tax accountant and watched interviews with a candidate accused of filing a client's return incorrectly. For some the mistake was framed as not knowing the tax rules, for others as deliberate. Trust recovered better when the candidate apologised for the competence version and denied the integrity version. The pattern held when later evidence showed the candidate guilty or innocent.
After deception, trust does not fully come back. Maurice Schweitzer, John Hershey and Eric Bradlow put 262 young adults through a seven-round trust game, published in 2006, in which the partner returned nothing in the first two rounds and a steady amount after that, and half the players were also lied to. Being deceived cut the long-run chance of trusting the partner by 37 percentage points. A promise to do better raised trust in the next round sharply and made no lasting difference. The apology on its own did almost nothing, then or later. The authors note their apology had no explanation, no offer of repair and no request for forgiveness in it.
Which parts of an apology carry the weight. In Lewicki, Polin and Lount's two studies, 333 and 422 online participants with an average of fourteen years of work experience rated apologies built from one, three or all six parts. The six-part apology beat the shorter ones in both. Taking responsibility was the strongest single part and asking for forgiveness the weakest. Apologies for a competence mistake worked better than apologies for an integrity mistake.
Every study here is either a mistake inside a supplier relationship that already exists or a laboratory task in which students and online workers judge a stranger. None follows a live deal that stopped. The one B2B study on channel is about mistakes in an ongoing account, not a buyer who went quiet during an evaluation. Nobody has compared a deal where the seller ran a repair with one where the seller carried on as if nothing had happened.
Name the mistake, lead with the fix, and choose the channel by whether you damaged the relationship or the process. Deny only when you are accused of dishonesty and the accusation is false, because an apology concedes the character judgement, and that is the judgement the evidence says does not recover. The order and the parts of an apology have been tested on buyers. The effect on a deal that has already stalled has not.