App review workflow. Each box header displays the workflow stage, examples of search terms used, and the number of papers used for that stage. The top-left box shows the search terms used for identifying rubric domains. These papers were reviewed to identify broad categories into which smartphone features could be organized for the rubric. The bottom left panel depicts the search string used to identify app dimensions within these domains (N = 498 papers, see also Table 1 for a detailed list of dimensions). In the central bottom panel, these dimensions are grouped by domain.