Usability expert Jacob Nielsen
conducted a reading speed study in which the iPad and Kindle2 opposed the usual printed book and computer. Only one candidate out of four showed very poor results.
The study involved a group of 32 people, where they had to read a short story by E. Hemingway, on each of the devices, as well as in the book. On average, they needed 17 minutes to do this. Each iteration was completed by a small check on the understanding of the text, to make sure that the text was really read and understood.
While reading on the ipad, the participants managed the text a little slower than reading from the printed book (6.2 percent slower). The iBook app from eppl was used here. The speed of reading from the Kindle was 10.7 percent slower. However, it does not follow from this that reading from one device is absolutely definitely slower than from another, but the difference is definitely small.
From the test it follows that the book is the favorite in reading speed.
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Also, study participants were asked which device they read most pleasantly from. On an ascending scale from 1 to 7 points, the score was 5.6 points, the iPad 5.8, the Kindle reached 5.7, and the computer ranked last with a rating of 3.6.
The weight of the ipad and the gray letters of the Kindle on a gray background were criticized. Reading a book was rated as more comfortable than using electronic devices. Reading from a PC monitor caused a negative feeling, because about the real work in the office.
In general, Nielsen positively assesses tablets and e-books that have received a readability rating even slightly higher than a regular printed book. He thinks that with an increase in screen resolution, this result will only be improved.