After using each of the devices for a few days, our 13 testers had definite likes and dislikes about each of the three...

The iPhone 3G got high marks for its "user friendliness". Strong, distinctive graphic design of each application symbol made selecting from the home screen easier than the others, especially for those with visual or cognitive limitations.

The Blackberry Storm earned praise for its "click-through" screen which allows the user to highlight a choice before selecting it, then gives a tactile click when the choice is made. Users with limited coordination found this helpful.

The HTC Touch HD was the only device of the three that allows use of a stylus. Nearly all testers appreciated this, since it increased precision in using the touchscreen, whether with the stylus, a fingernail, or a knuckle. The stylus also improved screen visibility, since it obstructed less of the screen than the user's hand.

Since so many of our testers appreciated the stylus of the HTC Touch HD, we expect that many of our visitors will be interested in the options for adding a stylus to the iPhone, Storm, and other devices that use capacitative touchscreen technology. Here are a few, including an interesting idea for making your own stylus! If you've tried any of these, please share your experiences...

http://www.tenonedesign.com/stylus.php

http://www.repairsuniverse.com/iphonepenb.html

http://pocketnow.com/tech-news/htc-hd2-capacitive-touchscreen-stylus-now-shipping

http://shop.brando.com/dagi-transparent-capacitive-touch-panel-stylus_p04019c0197d031.html

http://www.gottabemobile.com/2009/06/03/how-to-make-your-own-capacitive-touch-stylus-sort-of

Getting Started

The majority of the testers had little experience with touchscreen smartphones like those tested. Success or frustration with the first few tasks made a big difference in their confidence in completing the tests. For example, when the iPhone was switched on, the touchscreen presented a "Slide to Unlock" task on the touchscreen. Testers with manual limitations, as well as those with low vision or cognitive limitations, found this easy to do. This successful introduction to using the touchscreen encouraged them to explore the device further. In a similar way, the Storm presented a step-by-step tutorial when the device was first switched on, introducing the device's features and operations to the first-time user.

One of the first tasks each tester performed was the selection of text (font) size, screen brightness, audio volume, and other options. This was a good thing, since some testers found using the device very difficult until these options were selected. These testers observed that setting up the device requires dependence on a helper. This led to brainstorming about "self-setup" programs incorporated into the device, so that the new user could be led through the process in the same way the test leader did with each tester.

While these devices are sleek and stylish, nearly all of our testers accepted the silicone covers we offered for their use during testing. They felt that these "skins" made the devices easier to hold securely, or more stable when rested on a surface for one-handed use. Several testers also noted that controls which were difficult to locate on the exterior of the device were indicated with tactile markings on the skin, making them much easier to find and use.