Status and trends of mobile-health applications for iOS devices: A developer's perspective

Mobile shopping apps adoption and perceived risks: A cross-country perspective utilizing the Unified Theory of Acceptance and Use of Technology

Human-centered design can make application programming interfaces easier for developers to use.

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Improving API usability

In this paper we will present the concept of a system that allows for an evolutionary introduction of depth perception into the existing 2D digital TV framework. The work is part of the European Information Society Technologies (IST) project “Advanced Three-Dimensional Television System Technologies” (ATTEST), an activity where industries, research centers and universities have joined forces to design a backwardscompatible, flexible and modular broadcast 3D-TV system, where all parts of the 3D processing chain are optimised to one another. This includes content creation, coding and transmission, display and research in human 3D perception, which be will used to guide the development process. The goals of the project comprise the development of a novel broadcast 3D camera, algorithms to convert existing 2D-video material into 3D, a 2Dcompatible coding and transmission scheme for 3D-video using MPEG2/4/7 technologies and the design of two new autostereoscopic displays.

IST project ATTEST - an evolutionary and optimised approach on 3D-TV

The study integrated the Theory of Planned Behavior, the Technology Acceptance Model, and the Uses and Gratification Theory to predict young American consumers' mobile apps attitudes, intent and use. The model was tested by a web survey of 555 American college students in winter, 2011. SEM results show that young American consumers' attitudes and intent predict their use of mobile applications. Perceived enjoyment, usefulness, ease of use and subjective norm emerge as significant predictors of their mobile apps attitudes. Perceived behavioral control, usefulness, and mobile Internet use predict their intent to use mobile applications. Their use of mobile applications is determined by perceived usefulness, intent to use, mobile Internet use, income and gender. Implications for academia and industry are discussed.

Bon Appétit for Apps: Young American Consumers' Acceptance of Mobile Applications

Exploring the benefits of the combination of a software architecture analysis and a usability evaluation of a mobile application

The usability of Application Programming Interfaces (APIs) is one of the main factors defining the success of a software based framework. Research in the area of human computer interaction (HCI) currently mainly focuses on end-user usability and only little research has been done regarding the usability of APIs. In this paper, we present a methodology on how to use and combine HCI methods with the goal to evaluate the usability of APIs. The methodology consist of three phases - a heuristic evaluation, a developer workshop and interviews. We setup a case-study according to the methodology, in which we are evaluating the usability of a service-oriented framework API. The goal was to explore different HCI methods and compare the applicability of such methods to find usability problems in an API. The case-study combined qualitative and quantitative methods in order to investigate the usability and intuitiveness of the API itself. It allowed us to identify relevant problem areas for usability related issues that could be mapped to specific types of HCI methods. Examples for this are e.g. structural problems, which are identified mainly in inspection methods, while problems regarding errors and exception handling are mainly identified during the hands-on example part of the developer workshops conducted. The resulting problem areas allow us to develop a first classification of API related usability problems that are making the relevancy of usability issues for APIs more explicit and applicable.

/pdf/methods-towards-api-usability-a-structural-analysis-of-319l3zv03p.pdf

Methods towards API usability: a structural analysis of usability problem categories

Viewing experience of 3DTV: An exploration of the feeling of sickness and presence in a shopping mall

In this paper, we present an initial study towards of an indoor navigation system for blind people. As the system itself is still in an early stage of development, we conducted a Wizard of Oz study using a generic Wizard of Oz system designed for mobile and ubiquitous studies. The goal of the study was to validate a set of audio-based navigation commands in a field study context. Further, we wanted to identify usability issues of the Wizard of Oz tool, and ensure the appropriateness of the addressed study setup. Therefore, we used eight human wizards as participants in the study. Their task was to guide two blindfolded actors through a predefined route. Such settings helped us to achieve high ecological validity of the results compared to laboratory testing. We found that the developed study setup is fully mobile and can be used in any mobile context, the voice commands chosen for navigation are almost complete, and can be used with slight modifications for the follow-up study. Additionally we identified several usability flaws of the Wizard of Oz tool. After implementing the findings, the tool and the study setup are ready for a follow-up study with blind persons in order to validate the selected voice commands in depth.

Towards a navigation system for blind people: a Wizard of Oz study

When applying the Wizard of Oz (WOz) method to mobile and ubiquitous computing studies, the task of the wizard becomes more difficult as observing the user requires the wizard to be in the context. We address this problem through the ConWIZ system that allows not only to control a specific prototype but also to control parameters included in the contextual settings. In order to evaluate our approach, we setup a study with eight human wizards where we evaluated the applicability, appropriateness and usability of the ConWIZ system for mobile and UbiComp environments. Each wizard had to simulate a navigation system and control contextual parameters like simulation of wind by switching a fan on and off, and tactile feedback mechanism using the ConWIZ system. All wizards stated that the tool is definitely applicable and appropriate for supporting a mobile WOz study which allows the wizard to be hidden also if he resides in the study context. Regarding the applicability of the system, we found out that high workload may hinder the wizard from doing additional tasks such as note taking.

Thomas Grill

Papers

Exploring the benefits of the combination of a software architecture analysis and a usability evaluation of a mobile application

Methods towards API usability: a structural analysis of usability problem categories

Viewing experience of 3DTV: An exploration of the feeling of sickness and presence in a shopping mall

Towards a navigation system for blind people: a Wizard of Oz study

ConWIZ: a tool supporting contextual Wizard of Oz simulation