1. Research seminar Introduction Sergiy Vilkomir April 16, 2014 http://core.ecu.edu/STRG/

2. Device-specific failures Device-specific failures are very common for mobile software applications An application works reliably on many smartphones and tablets, but does not work properly (i.e., fails) on some specific devices Examples: App normally works under some specific operating system but fails under the latest or older OS Graphics created for high-resolution screens are not shown properly on the mobile devices with extra-high or low screen resolutions Factors: OS, screen resolution, screen size, device type (smartphone or tablet), handset manufacturer, RAM, etc. April16, 2014 2/2/ STRG

3. Device-specific failures There are many different mobile devices Sufficient testing is required on different mobile devices Such testing is expensive and time-consuming April16, 2014 3 STRG How many?

4. Android Fragmentation Visualized (July 2013) April16, 2014 4 STRG From OpenSignal, http://opensignal.com/reports/fragmentation-2013/ From OpenSignal: We have seen 11,868 distinct devices download our app in the past few months. In our report last year we saw 3,997

5. Research task Optimal selection of mobile devices for testing S. Vilkomir and B. Amstutz, "Using Combinatorial Approaches for Testing Mobile Applications", Proceedings of the IEEE Seventh International Conference on Software Testing, Verification and Validation Workshops (ICSTW 2014), March 31 - April 4, 2014, Cleveland, Ohio, USA, pp. 78- 83. http://core.ecu.edu/STRG/publications/Vilkomir-IWCT-2014-Proceedings.pdf April16, 2014 5 STRG Practical task How to test? Where to take mobile devices for testing?