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Ideally, your test subject will be somewhat familiar with the scope of your application In my case, my wife made the perfect test subject for Trip Cubby Her job required quite a bit of driving, and she had been tracking her reimbursable mileage with a convoluted combination of sticky notes and scribbles in her calendar Plus, she had been using an iPhone for a few months but was definitely not a power user Next, you need to set up a scenario and ask the test subjects to actually use your application The first time I had my wife test Trip Cubby, I handed her the iPhone and said, You just drove 33 miles to give a presentation at 123 Main Street Try entering that information into Trip Cubby Once your test users are in action, it s time for you to observe and resist the urge to intervene.

n = theVector.x * PI; ... NormalizeVector(&theVector, &normalizedVector); ... q = theVector.x / EPSILON;

Changing Your Default Mail Account (Sent From)

If you have multiple email accounts set up on your iPod touch, you should set one of them usually, the one you use most as your Default Account. When you select Compose from the Email screen, the default account is always chosen. Follow these steps to change the email account you send from by default:

In this code snippet, the value theVector.x will be loaded into a register to compute the value n. Later, theVector.x is used for another calculation, and the most optimal outcome is that theVector.x is still in that register. By defining inVec as a const, the compiler knows that the register containing theVector.x is still valid after NormalizeVector has been called because NormalizeVector could not have changed the value in theVector.x.

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It s best to have the test subjects vocalize their thoughts as they perform the actions By watching people interact with your application and listening to their thoughts as they walk through various scenarios, you should start seeing potential improvements in the UI If no one figures out that your cute little disk icon means save, maybe you should just use the word Save onscreen If the testers keep tapping the wrong button on a cramped toolbar, maybe you should leave a couple buttons off and make the remaining buttons bigger If users are completely stumped, and you have to intervene with several minutes of explanation, you should consider a complete overhaul of the UI! Usability testing is sometimes tough for developers who are attached to a particular UI implementation, but being flexible and willing to adjust the application to real world users is incredibly important.

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The iPhone and the iPod touch are audio devices, and as such, you d think that they have a lot of awesome audio hardware in them to make audio playback inexpensive, but this is not the case. The iPhone actually has very limited audio hardware, and most of the audio processing is actually done in software. As a result, audio can be very expensive in an iPhone game, but there are ways to minimize the impact. The original Mac version of Enigmo had music as well as sound effects, but the CPU load is so high in the iPhone version that we could not afford to play any music, and even the sound effects take their toll on the frame rate. I nearly had a heart attack when I first got the audio in Enigmo working because it caused more than a 20 percent reduction in frame rate. Even after taking out the music, the sound effects alone were hitting us with about a 5 percent reduction. Some of my games have warnings in the Settings dialog boxes, letting the user know that the game will run smoother if the user turns off the music. I don t want to bore you with all the details about how the audio channels work on the iPhone. Instead, I want to focus on the proper ways to format your audio to get the maximum possible performance from the system, so let s start with music.

Tap the Default Account option, and you will see a list of all your email accounts. Tap the one you wish to use as your Default Account choice. When you are done, touch the Mail, Contacts... button to return to the Mail settings menu.

My wife Elizabeth s first use of Trip Cubby is provided in the following section to give you an idea of the sorts of things you might hear from users during this process..

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