How to Win Friends and Influence People

Not a theory of psychology but a distillation of what Carnegie found worked in his own courses for working adults, illustrated with anecdotes from business, history and his students.

Its longevity is the fact that requires explaining. It has remained in continuous print since the Depression, which no comparable self-improvement title has managed, and the reason is that its principles address a set of interpersonal situations that have not changed.

Continuously in print since the Depression, because the situations it addresses have not changed.

Devmark’s reading — not a quotation from the book

His first and most demanding principle, supported by his argument that criticism puts people on the defensive, damages their sense of importance and almost never changes behaviour.

His observation that people rarely blame themselves for anything, however plainly at fault, is uncomfortably accurate and is the foundation for everything that follows. His opening examples are drawn from notorious criminals who regarded themselves as wronged.

His core psychological premise: the deepest ordinary human craving is to feel significant, and almost every technique in the book is an application of taking that seriously.

Its modern equivalents in social and organisational psychology — status, recognition, mattering — are better specified but do not contradict him. This is the part of the book that has aged best.

His six principles for being liked: take an interest, smile, use names, listen, talk in terms of the other person's interests, and make the other person feel important.

The word genuinely is doing essential work and is where most readers of this book fail. Applied as technique these are transparent and produce the opposite effect; applied as a description of attention actually given, they are simply how likeable people behave.

His twelve principles for persuasion: avoid arguments, never say you are wrong directly, admit your own errors quickly, begin in a friendly way, get the other person saying yes, let them do the talking, let the idea be theirs, see it from their perspective.

The strongest of these — let the other person feel the idea is theirs, and begin by finding what you agree on — appear in every serious negotiation text written since, usually without attribution.

His final section, aimed at managers and anyone with authority: begin with praise, mention faults indirectly, talk about your own mistakes first, ask questions rather than give orders, let the other person save face.

Letting someone save face is the principle most often cited by practitioners as the one that matters most, and it is almost entirely absent from modern management writing despite being decisive in practice.

Letting someone save face is decisive in practice and almost absent from modern management writing.

Devmark’s reading — not a quotation from the book

It is the standard criticism and it deserves a direct answer. The techniques can be used insincerely, and used that way they are manipulation.

Carnegie addresses this repeatedly and insists on sincerity, but he cannot enforce it, and the book's framing — the very title — invites instrumental reading. The honest position is that the principles describe good-faith behaviour and can be counterfeited, which is true of politeness generally.

The examples are overwhelmingly American, male, white-collar and of the 1930s, and the anecdotal evidence would not be accepted as support for anything today.

Its model of workplace relationships assumes hierarchies and social codes that have shifted, and its advice on flattery and on smiling reads as dated and, in some professional contexts, as gendered advice that has been applied unequally.

Because the underlying observations — that people want to feel important, that criticism produces defensiveness, that listening is rare, that agreement is easier to build from common ground — are accurate and have since been supported by research Carnegie did not have.

It is a book of correct conclusions reached by observation, without the evidence that later justified them.

The first principle, held strictly: stop criticising as a method of changing behaviour, since it reliably produces defence rather than change.

And the practice of letting the other person arrive at the idea, which is the most effective single technique in the book and the hardest for anyone who wants credit.