Everyone says it, but it is actually true: While this book is mostly my effort, it has been hugely improved via help from many other people.

First, a general thanks to everyone who read chapters and provided great comments: Steve Baty, Dan Brown, Dustin Chambers, Ruth Ellison, Leo Frishberg, Patrick Kennedy, Jorge Larango, Sam Ng, Kristi Olsen, Gene Smith, Peter Van Dijck, Steven Weintraub, and Alex Wright.

I also want to say a special thank you to two particularly special reviewers. Leo Frishberg and Dan Willis both did something quite hard and told me how bad my early version was. And Dan rewrote my entire chapter structure into something that made sense. Thanks so much to both of you for being brave, honest, and constructive--your comments made a huge difference, and this book is much better because of it.

It was great to be able to involve my closest friends as well. Ruth Ellison took photos and Caronne Carruthers-Taylor, Nigel Carruthers-Taylor, and Andrew Boyd posed for them. Thanks for sharing your time and company to help me illustrate how card sorting works.

One of the things I really like about this book is the case studies and quotes. They show that I'm not the only person who thinks this way, and they help highlight the key points. Thank you to everyone who provided case studies and allowed me to print their words.

I also want to thank everyone who has participated in a card sort I've run, including everyone who has done the winery card sort as part of one of my information architecture workshops. You've all helped me learn how people think, and I design better products as a result.

And the last thank you is to all the nice folks who have used my analysis spreadsheet and then told me how good it is. It is rewarding to see that something I knocked together for myself was actually handy for you. One day I'll hook up with a smart programmer and make a better tool to do this.