A person takes in information only when it reaches them in a tone close to the one they are in right now. That is why an enthusiastic reply to an angry client sounds insulting to him, even when its content is right. What works is meeting him at his level and rising from there by only a little.
Agreement happens at their level
According to the booklet this may be the most practical rule in it. The source says agreement happens at the emotional tone of the person who is speaking, and that people buy their facts at that level.
In plain language, a person accepts information from you only if the tone it comes in is close to the tone he is in himself. A frustrated person does not buy optimism, and a quiet person does not buy enthusiasm, even when the facts you bring are entirely correct.
In chapter 3 the booklet tests how the three corners of a relationship depend on each other with a simple question about talking to an angry man, and with an example of a price conversation with an angry client that has no chance. This chapter adds the missing piece: that kind of conversation has two problems, his anger and the distance between his tone and the tone you speak to him in.
It also connects to how the booklet defines reality, which is agreement. When your tone is too far from his, there is nothing between you to agree on, and the information does not go in, however well you reason.
Suppose a client who is angry about a delay, and gets an enthusiastic reply about how excellent the result will be. The gap in tone turns that reply into an insult, even though everything in it is true.
The reverse case: the same client gets a serious, matter-of-fact reply that says the delay is real and says what is happening about it now. The content is nearly the same, the tone meets his, and the conversation carries on.
Half a tone above, not five
If you only meet them, you both stay where you are. So there is a second rule. According to the source, going half a tone above a person's level leads him from within his own area of reality.
You do not need to measure half a tone scientifically. The practical meaning is clear: a little brighter than he is, and not a lot. Enough to pull him upward, and not so much that he no longer recognises himself in the conversation.
The source applies this to planning an approach as well. When you design your approach half a degree to one degree above the person's level, you can count on broad agreement.
Suppose a client in despair over a result she received. A reply that acknowledges her frustration, says there is a solution and offers to start from it, works. A reply that tells her not to worry because everything will be great does not.
Or an employee who is bored in his role. A calm, businesslike conversation that comes with a new task works. An enthusiastic motivational talk pushes him further away from you.
Notice that in both examples the reply that fails is the more positive one. It fails because it sits too far from where the other person is, and he no longer recognises himself in the conversation.
Penetrate instead of overwhelm
The chapter ends with a rule built on one repeated word: penetrate. Convincing and overwhelming are the two things to drop.
It continues the rule of the previous chapter, where agreement comes first and the message second. Someone who tries to convince starts from the contested point. Someone who penetrates starts from the place where the other side already is.
The difference is practical. Convincing tries to make the other side give up their position. Penetrating tries to get inside, into the range where they can hear you at all. According to the booklet, the first produces resistance and the second produces a conversation.
Suppose an owner who stopped trying to win price conversations and began asking the client what exactly he was comparing the quote against. His closing rate went up, and the price stayed the same.
Or a partner who stopped bringing figures into every talk with her business partner and began asking him what he sees. The figures came back into the conversation later, and this time they worked.
In both cases the same person, with the same information, moved from trying to win to entering the range where the other side can hear.
What the booklet adds
This chapter of the booklet comes with two exercises: a spot-it exercise and a build exercise. In the chapter after it, the booklet turns to the most common causes of a break with customers, and to how you prevent most of them in advance.
What is true but delivered in the wrong tone does not get in. When that happens, the gap lies between the tones, and your choice of words was fine.
The booklet is general knowledge about communication, not legal advice for a business dispute. The repair also depends on the other side.