Typing on mobile devices is a common and complex task. The act of typing itself thereby encodes rich information, such as the typing method, the context it is performed in, and individual traits of the person typing. Researchers are increasingly using a selection or combination of experience sampling and passive sensing methods in real-world settings to examine typing behaviours. However, there is limited understanding of the effects these methods have on measures of input speed, typing behaviours, compliance, perceived trust and privacy. In this paper, we investigate the tradeoffs of everyday data collection methods. We contribute empirical results from a four-week field study (N=26). Here, participants contributed by transcribing, composing, passively having sentences analyzed and reflecting on their contributions. We present a tradeoff analysis of these data collection methods, discuss their impact on text-entry applications, and contribute a flexible research platform for in the wild text-entry studies.

Word completion interfaces are ubiquitously available in mobile virtual keyboards; however, there is no prior research on how to design these interfaces for screen reader users. In addressing this, we propose a design space for nonvisual representation of word completions. The design space covers seven categories aiming to identify challenges and opportunities for interaction design in an unexplored research topic. It is intended to guide the design of novel interaction techniques, serving as a framework for researchers and practitioners working on nonvisual word completion. To demonstrate its potential, we engaged blind users in an exploration of the design space, to create their own bespoke word completion solutions. Through this study we found that users create alternative interfaces that extended current screen readers' capabilities. Resulting interfaces are less conservative than mainstream solutions on notification frequency and cardinality. Customization decisions were based on perceived benefits/costs and varied depending on multiple factors such as users' perceived prediction accuracy, potential keystroke gains, and situational restrictions.

The physical keypads that used to dominate our mobile devices provided additional support for non-visual interaction - the keys could be recognized tactually, the interfaces were simpler and consistent. When combined with a screen reader, these devices could be easily operated by blind people. The advent of smartphones, with their rich, feature-filled applications and interfaces, have brought forward additional challenges for blind users. Apps and features are no longer developed by a single entity leading to an overwhelming variety of interfaces. We present an approach that superimposes a virtual overlay to all other interfaces ensuring interface consistency by re-structuring how content is accessed in every screen. To explore the approach, we split the screen, dedicating half to a configurable set of static options mimicking always available physical buttons regardless of context; while the other enables the standard content navigation gestures with the ability to re-order content and apply filters. In a qualitative study with nine visually impaired participants, the virtual overlays were reported as simpler to use, while still providing full-fledged usage of the system and the third party applications, and were seen as effective and useful, particularly for novice users.