The challenges in large-scale smartphone user studies

We present preliminary results of a large-scale smartphone user study that examines how users interact with and consume energy on their personal mobile devices. Our dataset consists of over one millennium of user interaction traces from over 17300 BlackBerry users. Despite the scale and detail of the dataset, there are many research questions that it cannot answer; further user studies are therefore needed. We detail our insight into the major challenges in conducting a large-scale user study on BlackBerry devices.