http://www.nngroup.com/reports/mobile/ipad/ipad-usability_1st-edition.pdf
Pages 47-53 is about Affordance: Where can I Tap?
This basically outlines the issues with how big the target has to be to allow for everyone to tap it, meaning you cannot have a tiny target area where only people with tiny fingers can select it, as not everyone has the same size finger, so the best way to get around that is to make the target areas big enough for a bigger finger then you will know that everyone can select that particular area easily.
Pages 86-92 is about Usability Testing
This is basically where they describe the type of people they use and then what they use them for. For this if I was conducting a usability test I would get people who are within the ages of 21-54, male or female, however they have to already know about Peter James, and maybe would have read one of his books. With the other end of the scale I could get people who have never heard of Peter James and never read his books, to see if they would read his books after seeing my application.
Another usability issue that I would have to deal with is people who are colour blind.
http://colourblind.freeservers.com/whatis.htm This is the information I have got from this website:
'There are Three main versions of colour blindness. A red-green colour deficiency, blue-yellow deficiency and total colour blindness. Red-green deficiencies are the most common form of colour blindness. About 8% of men and less than 1% of women have a red-green deficiency.
People with a blue-yellow deficency have an absence of blue cones. This is quite a rare form of colour blindness.
Total colour blindness occurs when a person has no cones, only rods and can see only in black and white. This form of colour blindness is extremely rare.'
This means when I am doing my colour schemes I have to take into account what people will be able to see.
