Historical errata for Designed for Use

31.2 Paragraph 2
could’nt instead of couldn’t.

the book is sold with a cover and when the download version is opened we see the temporary cover.

In the footnote, the word “problems” should be singular. It should read, “Jakob Nielsen talks about this problem and offers …”.

In the caption for figure 9.1, the name of the application should be djay, not jday.

In the last paragraph on the page, you have, “User interface designers often call these affordances. I’ll talk more about this in Section 9.5, Principle 7: Affordances, on page 90.”. This sounds like you will be talking about this in the future but you are already in section 10.6 on page 99. I think it would be better if you refer to this information as already existing.

replace bike helmet study with less controversial example of unintended consequences

His explanations of why this is are fascinating

His explanations of why this is are fascinating

“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 reading less well.”

Perhaps the first citation was supposed to be “writing less”?

“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; the +1 removes that possibility.

Rather, size changes are amplified because size is a divisor. So if it is 0.5, changing it to 0.4 is just as effective as changing it from 500 to 400, and ID approaches infinity as size approaches 0.

The intended link at the end of footnote 5 was probably another, not the same as footnote 4.

Joel Spolsky’s book, User Interface Design for Programmers [Spo11], was published in 2001, not 2011.

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 movement time it takes to move between two spots, which is what we’re trying to figure out. Variables a and b are the intercept and slope, respectively, which are usually determined experimentally. D is the distance between the origin and the target. W is the width of the target.