Daniel Gonçalves

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The emergence of touch-based mobile devices brought fresh and exciting possibilities. These came at the cost of a considerable number of novel challenges. They are particularly apparent with the blind population, as these devices lack tactile cues and are extremely visually demanding. Existing solutions resort to assistive screen reading software to(More)
The emergence of touch screen devices poses a new set of challenges regarding text-entry. These are more obvious when considering blind people, as touch screens lack the tactile feedback they are used to when interacting with devices. The available solutions to enable non-visual text-entry resort to a wide set of targets, complex interaction techniques or(More)
Touch screen mobile devices bear the promise of endless leisure, communication, and productivity opportunities to motor-impaired people. Indeed, users with residual capacities in their upper extremities could benefit immensely from a device with no demands regarding strength. However, the precision required to effectively select a target without physical(More)
While there is strong motivation to do so, reading Web pages on portable devices still leaves much to be desired. Most solutions need special versions of Web sites and do not cope adequately with resource limits of PDAs, in particular their small screen, which makes it difficult to display large amounts of information in a usable manner. We describe an(More)
Touchscreen mobile devices are highly customizable, allowing designers to create inclusive user interfaces that are accessible to a broader audience. However, the knowledge to provide this new generation of user interfaces is yet to be uncovered. The goal was to thoroughly study mobile touchscreen interfaces and provide guidelines for informed design. The(More)
The NavTouch navigational method enables blind users to input text in a touch-screen device by performing directional gestures to navigate a vowelindexed alphabet. M obile phones play an important role in modern society. Their applications extend beyond basic communications, ranging from productivity to leisure. However, most tasks beyond making a call(More)
Well-designed games are good motivators by nature, as they imbue players with clear goals and a sense of reward and fulfillment, thus encouraging them to persist and endure in their quests. Recently, this motivational power has started to be applied to non- game contexts, a practice known as Gamification. This adds gaming elements to non-game processes,(More)