Advertising is based on the idea of convincing consumers that a perfect product will bring perfect happiness; Petroski offers the cold reality that since every product and service is created by humans, there is no perfect design.
Petroski is an engineer.
The first thing engineers learn, based on my ancient ordeal as an engineering student, is that nothing is perfect. Everything involves choices and compromises. Even when an engineer built "the one hoss shay" with such perfection that no single part would fail first, one flaw remained -- when it wore out, the whole thing collapsed instantly and completely.
At first, this book annoyed me. His first example of the epitome of design is the little plastic tripod that keeps the lid of a pizza box from being crushed onto the gooey surface of the hot pizza inside. There isn't even a name for that little tripod; failing anything else, you'd think someone would name it "Sam" in honor of holding up the roof. Samson, after all, was strong, useful and not quite perfect.
Yet, such is the genius of this book. He could have written about the design flaws that have caused two Space Shuttle disasters; instead, he takes everyday items we are completely familiar with and explains why these designs are less than perfect.
When an author can devote half-a-chapter to the design challenges of cup holders in a 1996 Volvo and make it interesting, you know he's onto something. Understanding why a cup holder in a car falls short of a perfect design, and why chairs, lightbulbs, door knobs, potato peelers, toothbrushes, paper bags and duct tape are still works in progress, gives you an appreciation for the design flaws in a Space Shuttle and in the human organization which launches Shuttles or even those which run the "intelligence" agencies. Only TV sitcoms and dramas offer "perfect" solutions -- which, in itself, is the major flaw of television.
Newspapers are sometimes called "a journal to expose the faults of the world and the typogarphical errors of its staff." The humour is barbed, but true. Petroski takes that idea a major leap forward, showing us in everyday terms why everything human's design is less than perfect. On that basis, he asks for an acceptance of the inevitable flaws of technology.
On the same basis, this book will give any thoughtful reader an appreciation of why everything is somewhat less than perfect, and thus all people should be ready to accept the inevitable flaws of others.