We try to keep our books accurate, but sometimes mistakes creep in. This page lists the errors submitted by our astute readers. If you've found a new error, please submit it.

The latest version of the book is P2.0, released over 2 years ago. If you've bought a PDF of the book and would like to upgrade it to this version (for free), visit your home page.

Key: Typo Tech. Error Suggestion Not a problem Next edition

By default this page displays the errata for the latest version of the book. If you have a previous version, select it here:  

(To find out what version you have, look at the copyright page, a few pages in from the front of the book. If it says (say) 'Second Printing', then here it'll be P2.0. If there are interim PDF releases in that printing, they'll be 2.1, 2.2, and so on.)

PDF Paper Description Found in Fixed in
NWsGs HLFMb
#49573: Thank you, Marti; we remember fodlny Lee's gentle way of sharing his intuitive understanding of permaculture- and his kindness, which seems t...more...
P2.0
26-Jul-12
47
#47356: "a 2007 study by the National Endowment for the Arts5 concluded that Americans are not just reading less than they used to, but they are also ...more...
Lukas Mathis says: No, the quote is correct; they're reading less (quantitatively), and less well (qualitatively).
P1.0
08-Aug-11
132
#50705: As someone suggest the formula in the book is not good BTW the exact formula it should be: MT= a + b * log2(D/W + 1) Where MT is the mov...more...
P2.0
04-Feb-13
132
#47589: "The formula for the ID is logarithmic" cannot be the cause of the statement that follows, because log only amplifies its argument if it is <1...more...
Lukas Mathis says: You're right. I'll fix this in the next edition. Thanks!
P2.0
17-Sep-11
168

#48861: The intended link at the end of footnote 5 was probably another, not the same as footnote 4.--Riccardo Mori

P2.0
02-Mar-12
301

#49267: Joel Spolsky's book, User Interface Design for Programmers [Spo11], was published in 2001, not 2011.--Andrew Broman

P2.0
03-May-12

Stuff To Be Considered in the Next Edition

PDF Paper Description Found in Fixed in
15

#47243: replace bike helmet study with less controversial example of unintended consequences--A medical doc

P1.1
03-Jul-11