Building Mobile Services for Older Adults

As we get older, our body is subject to a complex set of changes that influences our vision, hearing, cognition and motor control. These changes affect the way we experience a computer system. Many established interaction paradigms are therefore not suitable for older adults. For example, the scrolling of text via touch gestures on a mobile display requires precise movement control that older adults may not have anymore. The variations of...

Read More

Personalized Interaction with Multiple Items on Interactive Surfaces

Current interactive surfaces do not support user identifi cation. Hence, personalized applications that consider user-specifi c access control are not possible. Diverse approaches for identifying and distinguishing users have been investigated in previous research. Token-based approaches – e.g., which utilize the user’s mobile phone – are especially promising, as they also allow for consideration of the user’s personal...

Read More

Mobile Device Fingerprinting for Download Conversion Rate Measurement

An important analytical metric in the area of mobile marketing is not only the total number of mobile application downloads, but also the knowledge about the origin of these downloads. Mobile application developers, advertisers and marketers usually want to know which advertising campaign caused the user to download a mobile application. For instance, the origins of such downloads can be websites, social networks or classic...

Read More

A/B Testing of Native Mobile Applications

A/B tests or split tests are controlled experiments just like many other test variants. The main difference is that A/B tests are conducted while the product is used by everyday users, not during the production phase in a laboratory environment. In an A/B test, users are randomly split into two (or more) groups. Each group is then presented a different version of the user interface, which ranges from slight variations in the interface (like the...

Read More

Aspect-Oriented Interaction Logging in Mobile Apps

Sensing how people interact with their mobile phones under real-world conditions can be an expensive and time-consuming task, especially if data from a large number of users and over a long period of time is needed. However, in order to improve the utility and usability of mobile applications, field studies are often considered to be more suitable than laboratory evaluations. Thus, we developed an innovative approach towards the automatic...

Read More

Mobile Multi-Touch Visualization with Heat Maps

Heat maps are an important usability tool for visualising eye gaze data, mouse movement or click interaction on web pages. Regarding mobile applications however, use cases for heat maps are still limited. For example, eye tracking is difficult to realise due to limitations imposed by mobility or hardware requirements. Moreover, heat maps for understanding multi-touch interaction have not been used as a usability tool for mobile applications...

Read More